Russian Maritime ‘A2/AD’: Strengths and weaknesses

This is a follow up post to the A2/AD discussion dealing with Russian VKS and PVO-SV air defense, it is also meant to flog the discussion in this WOTR article on whether Russian A2/AD is a really a problem from a maritime perspective. Anti-access/area-denial has some purchase as a concept in the maritime domain, but it was meant to be a conversation about China. The term has been lackadaisically applied to Russia because defense ‘strategists’ group similar capabilities into a common functional problem. This then allows them to say ‘Russia and China’ = problem X, and even worse, if we buy capability Y to deal China then it will definitely work for Russia because we have now declared these to be the same problem set.

This post is not about operational concepts, but again the tactical side of things, as there has been some debate on the efficacy of Russian A2/AD systems. Hence I hope to tease out a conversation on how things work, or don’t probably work, and areas where I think we don’t necessarily know (or maybe just I don’t know).

In the Russian case what gets touted as A2/AD capabilities are just land based coastal defense systems, which for Russia is somewhere between Plan C or Plan D in order of echelonment for dealing with a blue water navy. It mostly misses the plot of Russian thinking about maritime strike. The Russian Navy has historically pursued a damage limitation strategy, starting with forward deployed guided missile ships/submarines, land based aircraft with anti-ship missiles, then offensive/defensive mining and CDCMs.

However, for littoral NATO states in the Baltic/Black Sea with small navies the missile batteries pose a pretty big problem, quite relevant for those who start within the alleged range rings. Think tanks and defense industry advocacy organizations often offer us these scary circles, but does starting within range of these systems equal automatic attrition? The answer is depends.

a2ad rings
map of very scary a2/ad things

How capable are Russia’s coastal defense cruise missile batteries? (A2/AD things) Precision strike in the maritime domain depends heavily on queuing, and having a workable kill chain, because unlike buildings ships move around. This means having to address technical things like over the horizon targeting, satellite targeting, etc. Being able to find and fix the actual target is most of the problem. The range rings drawn based on missile flight range don’t mean anything, plus they probably don’t reflect the actual ranges anyway. Second, the most important leg in this supposed A2/AD chain is still land based aviation, both for queuing with maritime patrol aircraft, and the ability to conduct strikes against maritime targets.

The bulk of the Russian coastal defense force includes the BAL, which fires 8 x Kh-35E subsonic missiles per TEL. This system delivers a salvo of up to 32 missiles per battery, with subsonic anti-ship missiles at a max range of 260km. The Bastion-P fires the P-800 Oniks, which is advertised at 450/500km on a high trajectory, 300km combination medium-low, and 120km with a low-low flight profile. It is possible that P-800 Oniks actual range could be further than officially stated given some of the statements that occasionally come out of India about the capability of their Brahmos. Of course ships have numerous countermeasures, defenses, and can use geography to hide, so one should not presume that the Russian ability to hit a ship guarantees that a missile will connect with the target.

These CDCM batteries come with their own Monolit-B targeting radars. Russia’s defense export sites claim that they have an active radar mode (35km), over the horizon radar using waveguide (90km), over the horizon using refraction (250km) passive targeting mode to detect emitting radars  (450km). We can take that with a grain of salt, but the numbers listed don’t seem especially fantastical. It comes in a pair of transmitting and receiving vehicles. They can receive targeting data via data link from airborne units, like Ka-31 helicopters, reconnaissance aircraft like Su-24MR or MP, or potentially the much longer range Il-38N and Tu-142 (Bear F). Russian forces also use larger over-the-horizon radar (OTHR) arrays, such as the high frequency surface wave Podsolnukh-E (OTH-SW) systems found based around Russian fleets (200-450km), or the much bigger Container (OTH-B) array located deep in Russia with a range of 3000km+.

Podsolnykh-E OTH-SW

One of the questions occasionally raised is whether they can they hit anything using the OTHR? It has been alleged that using OTHR is basically just firing blind, and I don’t think that’s the case. I’m not an expert on OTHR systems, but it would be a really poor investment to buy such long range missiles without investing in a viable targeting system for them, and to pair them with so many unhelpful mobile OTHR systems. The battery’s organic Monolit-B radar is relatively short range, but it is supposed to not only detect targets beyond the radar horizon, but also classify them, and one wonders whether that is all a big lie. OTHR has a lot of problems, but with modern signal processing technology the current generation of OTH-SW and OTH-B systems could be much better. I would not bet the ship on the proposition that Russian OTHR systems cannot effectively see and classify targets over the horizon.

Depiction of Monolit-B and Ka-31 used for targeting

Given the various forms of civilian traffic control, ship automatic identification systems, it may also be possible to easily cross reference signals to separate military from civilian traffic. In a Russia v NATO fight, most of the traffic will belong to combatant nations, and might be considered fair game by the adversary. ELINT based targeting seems to be another functionality of the Monolit-B, and is useful for space-based targeting, which we will get to late. The extent to which a target is cooperative makes a significant difference.

Of course coastal defenses often rely on Su-24MR or Ka-31 helicopters to confirm targets at longer ranges, and while these can be shot down, the numbers game doesn’t look great. Also the act of shooting down an aircraft with ship based air defense system means becoming a cooperative target that identifies you to passive means of detection. Coastal defense units are shifting to drones for recon-strike targeting, like much of the Russian ground force, which means there are simply going to be too many cheap ISR platforms in that tactical-operational range of 100-300km. There is a panoply of means to classify a target, from a guy with a radio on a fishing trawler, to an AGI, to drones, aircraft, and helicopters.

The second half of the package is the missile. Russian anti-ship missiles are advertised as having a sophisticated seeker with active radar, home on jam, ability to de-conflict with other missiles, and a complex flight profile. Soviet missiles were known to be quite smart, able to de-conflict with each other, execute search patterns to actively scan for targets. There is no reason to assume modern Russian missiles can’t do the same, but better. The missile can do quite a bit of the work of classifying and differentiating targets, i.e. it will figure out which one is a fishing boat and which one is an AEGIS destroyer on approach.

P-800 Oniks

What about land based naval aviation?

The Russian A2/AD discussion often overlooks the fact that coastal defenses are just a backup for other defensive layers, from ships and submarines to the Russian air force, which is partly what makes it unworkable as an alleged strategy. It’s the last layer of defense for Russia’s maritime approaches, not the primary one. Against a blue water navy it is near useless since there is no reason cruise missile carrying platforms, or carriers, need conduct operations within range of Russian ‘A2/AD’ capabilities.

The USSR began to think along these lines in the early 1960s once carrier based aviation got longer legs, hence the damage limitation strategy. Basically the A2/AD business doesn’t solve any of Russia’s central problems with U.S. naval power projection, which is again why there is no strategy just based on these capabilities. They are a relatively close-in layer for defending Russian littorals and maritime approaches but not the basis of Russian strategy. (More on that in this article.)

Russian long range aviation took the Tu-22M3s from the Navy back in 2011, then got converted into the VKS Aerospace Forces in 2015. This means that part of the maritime strike mission is in the possession of the long range aviation component (LRA) of the VKS. We can add to this the Su-34 bomber, Su-24M2 tactical bomber, and the Su-30SM heavy multirole fighters assigned to naval aviation regiments. It is hard to know what might be operational from the Tu-22M3 force, but it is safe to assume that what’s left is a relatively small force compared to the heyday of Soviet naval aviation –  a couple regiments strong at best. Tu-22M3s, even in small numbers, pose a challenge because of the range of their Kh-32 missiles.

The Su-34s are worth looking at, because the Russian VKS has received 125 of them and they have increasingly been practicing anti-ship strikes with Kh-31 and Kh-35 in exercises. The Su-30SM is also suitable for this role with 114 delivered, although a relatively small portion of these went to naval aviation regiments. Land based aviation is becoming more of a player in maritime strike and I think this space is worth watching. I will skip the Mig-31K because it’s not clear right now where it will get the queuing from to target the Kinzhal ALBM against high value naval platforms.

Su-34 with Kh-35
Su-34 with Kh-35 in Syria

The main limitation on Russian naval aviation is the availability of Il-38N and Tu-142 long range maritime patrol aircraft. This means that Russian aviation looks good at the operational range of 300-500km, but anything beyond that starts to get problematic given the limited availability of long range ISR platforms. Limited availability is sometimes used as a euphemism for ‘they can’t do it,’ but what it translates into is intermittent coverage, or a high chance of running out of assets due to attrition.

Can space based means be used to target at sea? It depends.

The Soviet Union used two space based ISR systems for targeting: Legenda for maritime reconnaissance and targeting, and Tselina for radio-technical reconnaissance (ELINT). These constellations used nuclear powered, and solar powered satellites of the «УС-А» (active radar) и «УС-П» (passive detection). They provided targeting information at sea and transmitted it to ships or guided missile submarines, like the Oscar-II armed with Granit missiles.

However, both space based recon systems are considered to have ceased functioning some time ago, to be replaced by the Liana system which has had trouble getting off the ground. Liana was meant to consist of two Lotos electronic signals intelligence satellites, and two Pion-NKS radar reconnaissance satellites. Lotos had problems in development, consistent with much of Russia’s space program, but the first satellite went up in 2009. It was followed by three Lotos-S1 satellites, though none of the Pion-NKS satellites have been launched. Izvestia reported last year that both Pions were supposed to be launched by January 2020. Given I’m writing this on January 28, it’s safe to say that’s probably not going to happen this month.

According to numerous public sources a Russian constellation of ELINT satellites designed to listen for cooperative targets does exist (possibly 3x Lotos-S1), but the two Pion-NKS radar satellites do not. Once the Pion-NKS are launched though, which could be this year, the Liana system will be working with satellites able to see ships on the ocean’s surface and transmit that data to Russian forces. This will make a difference in kind when it comes to the Russian forces’ ability to target ships via any land based or sea based platform.

Lotos-S1 model
Lotos-S1 model (from

Wrapping up

There are limitations to Russian A2/AD capabilities, but they were never meant as a strategy. The strategy was and remains damage limitation, which in part is based on layered defense, but also preemptive destruction of long range strike platforms. Coastal defense is about covering the littorals and key maritime approaches. The challenge began to loom because missiles got better, radars got better, and NATO expanded – so now what was a layer of coastal defenses has become an A2/AD capability affecting sea denial in much of the Baltic and Black Sea.

This places the emphasis on the wrong capabilities. The focus should be on ISR, and the potential for land based strike aviation to make an impact. I also think offensive and defensive mining gets overlooked as one of the most effective means of denying an entire area to an adversary because its not as flashy as modern missiles. Limitations in ISR make ‘a2/ad’ rather dodgy beyond tactical-operational ranges, and there are legitimate questions about what Russian OTHR can actually deliver without additional sources of target identification. That sets up a somewhat bifurcated threat, as the Russian ability to see is pretty good at tactical-operational ranges, and not so good beyond them.

These complexities of course do not stop defense intellectuals from trotting out theories that Russia has an ‘A2/AD strategy’ and will terribly coerce NATO in a crisis with shiny missiles. A real interdiction strategy would involve sea lines of communication. During the first half of the Cold War it was long held that the USSR had a SLOC interdiction strategy before the navy eventually conceded that actually it was chiefly a withholding strategy for SSBN bastion defense. There is no evidence that anything has changed on the Russian side, besides having far fewer operational submarines available to pursue SLOC interdiction.

However, we should not tilt towards cavalier or overly dismissive assessments. Russian forces are getting more eyes, buying more aircraft, drones, missiles, and upgrading maritime patrol aviation – so the trend line is clear. I think the extent to which ships become cooperative targets as they maneuver will have a significant impact on the ability of these various systems to detect and classify targets at longer ranges. That’s probably not a revelation, but it is interesting how much passive detection plays a role in the efficacy of Russian anti-ship targeting systems.

Feedback and comments welcome –


Russian A2/AD: It is not overrated, just poorly understood

There were several articles in 2019 attempting to address the Russian anti-access/area denial (A2/AD) problem set, in my view an unfortunate term that got transported from the China watcher community and slapped onto Russia, even though it has preciously little application in Russian military strategy or doctrinal thought. In a late 2019 WOTR article, which proved quite long, I sought to tackle the operational level thinking in the Russian military for how different capabilities listed under the A2/AD umbrella are likely to be used, illustrating that no A2/AD defensive doctrine or strategy exists. Russian forces are organized around offensive/defensive strategic operations which do not suggest the intention to sit back in a defensive bubble and get eaten by a U.S. led aerosopace attack.

However, this post is about the tactical side of things, and a series of claims made by colleagues about Russian A2/AD capabilities being overrated that I think need addressing. Technology fetishism and threat inflationism seems to be giving way to a dismissive attitude in some circles which is equally problematic. In my view these capabilities are misunderstood. I will briefly tackle air defense and a couple items I think it’s useful to consider on this subject. Just to be frank, this is going to be fairly rudimentary because I’m not an engineer and math is not my preferred language – on the other hand readership dramatically declines with each math formula or table you include in a post.

The first challenge with Russian air defense is the almost wanton confusion between Aerospace Forces (VKS) fielded systems, ground forces fielded air defense systems (PVO-SV), and the Russian air force within the VKS, which is often missing from this picture. Basically, much of the writing presumes that Western forces can fight the S-400 on its own, and you have a number of reports from well meaning countries that attempt to simulate the battle of NATO versus Kaliningrad, as though Kaliningrad was a country and not a tiny grouping of Russian forces relative to the whole. Given Russian framing of any conflict with a coalition of states as a regional war, we need to think about how Russian forces organize for large-scale warfare in the TVD (theater of military operations), and in a geographical span running roughly from Norway to Turkey rather than some contrived pinky fight in the Baltics.

IADS belonging to VKS

Integrated air defense systems under VKS include the S-300 line of S-300PMU1/2, S-400, S-350 and point defense systems like Pantsir-S1. These systems are used to defend Russian critical infrastructure and ‘strategic deterrent forces’ assigned to execute strategic operations. They may cover Russian ground forces, but are not necessarily vested in defending them since the army has its own air defense component. While the S-400 may be ‘overrated,’ the echelonment of these systems creates layers of defenses at different ranges, but most importantly with different types of missile seekers. These systems provide overlapping coverage for maximum attrition, but what they really do is defend critical civilian and military objects at operational or strategic depths.

The 200km 48N6E2 and the 250km 48N6E3 is semi-active, but the much shorter range 9M96 series (60-120km) is active radar homing. The extended range 40N6 400km missile appears to have achieved initial operating capability, and also comes with an active radar seeker, although I’ve never seen the container for it. These systems excel at medium-high altitude, while the active radar homing missiles pose a challenge for pop-up attacks, low-flying aircraft, or helicopters. We will touch on low altitude penetration a bit later.

Although there have been claims that you can simply take out one engagement radar and thereby neutralize an entire battery of 6-8 TELs, it’s not clear that this is remotely true. That would somewhat defy the concept of integrated air defense and it’s probably not quite that simple given the proliferation of automated systems of command and control at all echelons of the Russian armed forces. It would be safer to assume the Russian VKS thought of that and there’s a Plan B + Plan C to ensure redundancy.  This assumes that TEL #1 can only talk to fire control radar A, but cannot communicate with fire control radar B assigned to TEL #9, even though there are dedicated C3 vehicles deployed with them to enable high bandwidth communication.

Typically these systems are co-located with Pantsir-S1 batteries which provide defense against cruise missiles, and missiles intended to take out the S-400. There will also be plenty of EW systems to make life more complicated and effect disorganization on the incoming aerospace strike.


The main problem for Russian air defense is stealth and saturation. The former can offer considerable standoff relative to the effective engagement range, and the latter can simply overwhelm with munitions, decoys and drones. Low observation characteristics substantially reduce the effective range of fire control radars, which means that most of the range rings shown as ‘angry circles of death’ are meaningless. This is part of the reason why there is no Russian strategy based around bubble defense, because it’s not really possible against 5th gen, and even less so against cruise missiles. Hence there is no area denial, and not necessarily anti-access either – think more attrition, disorganization, and deflection.

However, statements about the advantage of low observation aircraft should come with caveats. Stealth does not mean invulnerability. The proliferation of increasingly mobile low-frequency Russian radars, like Nebo-M, which operate in the L-band, VHF, and UHF, means that stealth aircraft can be seen, just not necessarily engaged. These radar systems used to be quite large and clunky due to the antenna aperture required, but are now far more portable with shorter setup times. That said, any air defense network starts to develop gaps once you take down enough radars.

Most of the arguments about a Russian A2/AD strategy based on zonal defense amount to defense intellectual gobbledygook attempting to portray Russia as 1973 Egypt (limited offense followed by area defense). Here is a good example of how Russian writing depicts the problem of deflecting and attriting an aerospace attack. Note the emphasis is on the stack of threats in the aerospace domain, from low-altitude to space based assets, and the ability of Russian air defense to defense critical infrastructure/strategic deterrent forces.

Arsenal Otechestva Effektivnaya Razvedka Protivnika
Arsenal Otechestva – Effektivnaya Razvedka Protivnika
Militarizatsia Kosmosa Neisbezhna
Militarizatsia Kosmosa Neisbezhna

Reading Russian military thought articles on the problem of U.S. massed aerospace assault, and the damage that numerous long range precision guided munitions could inflict, one gets the impression that they understand where things stand perfectly well – and they don’t like it.

That leads us to the second problem, the air force component of the Aerospace Forces, which is probably somewhere in the range of ~800 tactical aircraft. The majority of these have been modernized or replaced with new variants 2011-2019. These fighters are an integral part of the Russian air defense network, and will be looking to engage any aircraft penetrating it, which will be seen on low frequency search radars whether they are 5th gen or 4th gen.

A fair bit of writing presumes that one can perform a SEAD or DEAD mission, tackling VKS owned IADS separately, while the entire Russian air force sits parked and waits for its turn to fight, which is unlikely. Russian fighters will naturally fill the corridors or gaps between Russian air defenses, and will be guided by radar systems that can see low observation aircraft. The Su-57 seems well suited for that role. The limited availability of AWACS aircraft (A-50U) in the Russian air force is an enduring issue, but Russian fighters are primarily guided to intercept via ground control stations utilizing ground based radar. The air defense system as a strategic network is really a combination of radars, integrated air defense, tactical aviation, and missile defense.

Here is a list of aircraft deliveries I pulled from BMPD’s recent update.

Aircraft deliveries

My sense is that the 5th gen versus modern IADS + air force is the sort of thing that will either go really well, or quite poorly, without a lot of in between. Either way the Russian air force is likely to preemptively conduct its own aerospace assault, as part of the strategic aerospace operation, and together with long range aviation wipe out as many air assets as possible on the ground (covered in the WOTR article). Cruise missiles don’t really care if you have 4th gen or 5th gen on the runway. Remove air refueling and AWACS from the picture, things start to get less rosy.

What about Low-Altitude?

It has been asserted that one could simply negate the range of many of these systems with low altitude penetration, going in old school to negate the advantage of long range radar air defense systems. One can understand the visual appeal, complete with Kenny Loggins’ Danger Zone playing in the background. There are a few problems with this theory. The first is that 5th gen aircraft are optimized for the medium-high altitude penetration mission – stealth loses a lot of its value if you can literally see the plane and shoot it down with almost any type of short range system (SACLOS/IR/SPAAG/bow and arrow).

It’s not clear to what extent any Western air force, with the exception of Israel, spends much time training for low-altitude penetration, and while the aircraft can do it, many pilots probably cannot. Without training, nap-of-the-earth flight is likely to result in disaster before Russian air defense can even have a chance to shoot something down.

The second problem is that it’s not a cure-all given many Russian radars are found raised on masts, plus most Russian systems carry a shorter range active radar seeking missile variant. As the S-350 proliferates in the VKS, and the Buk-M3 in PVO-SV, this will become even more of a problem. Naturally the earth’s curvature dramatically affects radar range against a low flying target, but there is a great deal of complexity that goes into assessing a radar’s effective targeting range over the horizon – especially since atmospheric conditions and terrain play an important role. I’m an expert on none of these things, but Russian search and fire control radars frequently come mounted on 24 or 40 meter masts. We should ask why.


Some basic calculators I found online show that all things being equal against a target flying at 100 meters your targeting range from a 5 meter height is only 27km, but from a 24 meter height you get 62km and from a 40 meter height 67km (hopefully I got those right). I’m not a radar expert, but the Russian military likes to put them on telescopic masts for a reason. If you can see the air defense radar in a 4th gen aircraft then it can probably see you. This problem might be solvable by pop-up attacks when dealing with semi-active radar missiles, but then you have a batch of 9M96 active seeking missiles to deal with because the radar only needs to see you for a brief amount of time and the missile seeker will figure out the rest of the problem.


It is also worth mentioning that the proliferation of Russian over the horizon radar systems pose a challenge for launching an aerospace attack undetected at any altitude. The relatively short range Podsolnukh-E, which uses the ocean as a conducting surface can see 450km out and being deployed with every Russian fleet. Strategic OTH systems like Container are located deep inside Russia and can see most of Europe’s airspace at ~3000km range. This simply means that Russian VKS will see an aerospace attack coming whether it is high, medium, or low altitude and without that element of surprise you get more attrition.

The last problem is that by avoiding VKS IADS an aircraft may quickly become best friends with Russia’s PVO-SV.

The PVO-SV problem for low or medium altitude

Air defense units belonging to the Russian land forces (PVO-SV) do not need VKS IADS, because they carry a thicket of their own air defense systems to cover the maneuver formations. These include Tor-M1, Buk-M2, various radar assisted gun systems, and MANPADS. The problem with attempting low altitude penetration or close air support against Russian ground forces is that they have a very high density of short range air defense systems able to reach to medium altitude.

Newer systems add to the challenge. Buk-M3 is much more capable than its predecessors, with active radar homing missiles (70km on 9R31M), a separate radar that can be raised on a retractable mast, and a containerized missile for quick reloads. These more capable systems are to be found in air defense brigades include S-300V4 and Buk-M3, while M2 is probably going to stick around in air defense regiments/brigade. Almost anything in the PVO-SV arsenal can shoot down cruise missiles, although that’s not their primary mission.


Meanwhile S-300V4 is really the mobile missile defense system for the Russian ground forces, designed to provide standoff capability against high value aerial assets like AWACS, or jammer aircraft. In terms of capability this has always been a more interesting system than the S-400, because of its ability to engage ballistic missiles, cruise missiles, and maneuverable aerodynamic targets. This system was deployed to Syria, and largely unnoticed given the fixation on the S-400. Antey fielded a 400km missile against low maneuverability targets, 9M82 ‘Giant’, well before the 40N6 went into development for the S-400. The 9M83 ‘Gladiator’ missile is comparable to the 48N6 line, and the system components are tracked which makes them quite mobile. S-300V4s are due for an upgrade, and will be bought in increasing numbers for Russian air defense units assigned to fleets. I would watch this space – PVO-SV is going to get a lot more capable in the coming years.


Wrapping up

So Russian A2/AD is overrated in large part because of our own technology fetishism and terrible understanding of how Russian forces are actually organized. It does not exist as a doctrine, or a military strategy, but we should not over simplify the discussion in attempts to debunk the tactical capabilities of Russian military technology. All you have to do to achieve air dominance is eliminate the VKS radars, the low-frequency radars, and the Russian air force – then you’re largely ok right after dealing with the countless PVO-SV air defense systems. Assuming you don’t run out of munitions early on into this process, or aircraft, and all the high value enabling platforms do not get attrited, then it’s a manageable problem.

In some respects Russian IADS are a sort of McGuffin plot vehicle. As long as time and munitions are spent on them, Russian critical objects are safe, and one way or another the IADS end up executing their mission – which is not to defend themselves but to defend that which is strategically significant for the success of operations in the TVD.

In my view the balance of aerospace assault vs air defense remains offense dominant (I understand offense/defense dominance is not a thing because Keir Lieber says so), but  that is probably not enough to offer confidence in the initial period of war. The problem is that Russia’s military has always seen defense to be cost prohibitive, and there for focused on an offensive damage limitation strategy + functional defeat of the adversary. So whether you think Russian A2/AD systems are amazing, or overrated, just remember – there is no such doctrine or term in the Russian military and the conversation misses the plot on how Russian forces actually organize at the operational-strategic level.

For a better, but longer explanation on operational level organization in the TVD, and Russia mil strategy check here.