In war, nothing is inevitable and not much is predictable. But the war in Ukraine has a direction that observers can see and that we should name. What began as a criminal Russian aggression against Ukraine has become a proxy war between Washington and Moscow. The two sides are locked in an escalatory cycle that, along current trends, will eventually bring them into direct conflict and then go nuclear, killing millions of people and destroying much of the world. This is obviously a bold prediction and certainly an unwise one to make in part because if Im right, Im unlikely to be around take credit for it.
President Joe Biden has named this danger, to great criticism, apparently because he believes that acknowledging the danger increases the chances of avoiding such a terrible outcome. Indeed, much can change the current trajectory, but doing so will require purposeful action by both sides specifically intended to avoid direct confrontation. At the moment, neither side seems willing or politically able to take such steps. On the contrary, in Russia nuclear threats are a prominent part of the Russian war strategy. In the United States, commentators condemn those who even name this danger, fearing that doing so will weaken Western resolve. Any mention of such considerations on Twitter, where it is always 1938, inevitably provokes accusations of appeasement and references to Neville Chamberlain.
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Despite the opprobrium, not naming the danger is unlikely to reduce it. Think tank analysts prefer instead to talk in terms of scenarios, wherein we can bury the most likely outcome amongst a few other less likely possibilities. Such exercises are useful for planning purposes, and they appropriately reflect our general inability to predict events on the ground. But scenarios also serve to hide the relative likelihood of the various outcomes. Here I present just the central scenario of nuclear escalation. I take as a starting point that, although we may experience long periods of relative stalemate and we may never arrive at such a horrific outcome, uncontrolled escalation is the path that we are currently on.
Testing the Red Lines
No rational or even sane leader plans to start a nuclear war. And for all of the Russian regimes risk taking, it does not show signs of suicidal tendencies. The essence of the problem is more insidious than mere insanity: Once an escalatory cycle begins, a series of individually rational steps can add up to a world-ending absurdity. In Ukraine, both sides have publicly pledged that they cannot lose this war. They hold that doing so would threaten their very way of life and the values that they hold most dear. In the Russian case particularly, a loss in Ukraine would seem to threaten regime survival and even the territorial integrity of the country.
As the war has moved against the Russians, they have drawn numerous red lines to warn the West against escalation. The Russians called the provision of long-range rocket systems near the Russian border intolerable, warned against the admission of Sweden and Finland to NATO, and threatened that any attack on Crimea would ignite judgment day. In each case, the crossing of these Russian red lines by Ukraine, the United States, or Europe generated some sort of response but fell well short of Russian threats.
As Russian red lines have proven very pink, they are increasingly questioned in the West. Numerous Western commentators now assert that Russia is a paper tiger and dismiss Russian nuclear threats as bluster. The most recent Russian red line warns against the provision of long-range missile systems to Ukraine. The Russian government says that if the United States crosses this line, it would become a direct party to the conflict. Given all of the red lines already crossed, however, it is doubtful that U.S. decision-makers see such threats as very meaningful.
The problem that the Russians have had in their signaling is that their decision to escalate likely revolves around the progress that the Ukrainians make on the ground, not on any discrete action (such as the provision of new weapons systems) that the West might take. The likelihood of escalation, in other words, has stemmed from developments on the battlefield, not from the crossing of some arbitrary red line. Experts on the Russian military have long suspected that Russian nuclear signaling is an elaborate bluff meant to instill fear and caution in a weak-willed Western enemy. But events in Ukraine and the possibility of a catastrophic military loss may have changed that calculation. Nobody really knows. It is likely that the Russians dont know either.
What is clear is that both sides have consistently escalated in Ukraine when they fear that they might lose. The United States and its European partners have continually upped their military assistance to Ukraine, in both quality and quantity, regardless of red lines. Under the pressure of war, they decided to deliver weapons and intelligence that just a few months ago they believed carried too great an escalation risk to provide. They have similarly incrementally increased economic sanctions to the degree that they now appear intended to permanently weaken Russia and destroy the Russian regime, as Biden has said is necessary to end the war.
The Russians have consistently responded to battlefield setbacks with their own escalations including energy cut-offs to Europe, increased bombing of civilian targets, and recently through the formal annexation of four Ukrainian provinces and the partial mobilization of Russian manpower reserves. This last step carries obvious risks for the Russian regime, as the multiple protests against it across Russia testify, but the leadership preferred those domestic risks to losing the war.
In taking these escalatory steps, both sides have also increased the domestic and geopolitical costs of compromise, thus increasing the incentive for further escalations. Thus, for example, the Russian annexations are intended to signal to foreign and domestic audiences that the occupied parts of Ukrainian territory will now be defended as if they were Russia itself. But it is not just a signal, it also genuinely reduces Russias ability to back down and abandon these provinces. This is essence of an escalatory cycle it contains a logic of its own wherein previous escalations make future ones more likely.
Of course, wars have often escalated but no war since 1945 has ended in nuclear use. Nuclear powers have at times considered their use for warfighting, notably in Korea in 1953 and in Israel in 1973, but have always stepped back from the brink. In the current situation, both sides have many more steps to take before direct confrontation: The United States has many more weapons systems to provide and many more ways to isolate the Russian economy. Russia has many more men to conscript, more brutal tactics to apply, and of course more horrible weapons to deploy short of nuclear weapons. It is likely that if the war simply bogs down into a war of attrition, that will not be enough to get to nuclear use.
Instead, escalation to nuclear weapons will require one side to feel that it is losing and that a military defeat will have catastrophic consequences for their regime and the personal safety of its leadership, and to convince itself, under the pressure of looming military defeat, that nuclear use is the way out. We have no precedent for those conditions being met in a nuclear-armed state.
The Danger of Geniuses
It is not hard to imagine how they might be starting from where we are today. If the war continues to move against the Russians, and particularly if the Ukrainians begin to invade Crimea, they will reach ever greater levels of fear that the future of the Russian regime is at stake. Some genius within the Russian leadership will then put forward the idea that they can reverse the momentum and demonstrate their greater willingness to accept Armageddon by a nuclear demonstration. As Michael Kofman and Anya Lukianov Fink have noted, Russian military analysts have long believed in a demonstrative use of force, and could subsequently include nuclear use for demonstration purposes. The West, this Russian optimist will argue, doesnt really care about Ukraine and will recoil at the real prospect of nuclear war. Lacking better options, or really any other options at all beyond surrender, Russian President Vladmir Putin (or his successor) will seize on this deus ex machina. Such thin hopes of turning defeat into victory are the most effective enemies of peace.
Russian forces will launch a small number of tactical nuclear attacks against Ukrainian troop concentrations or NATO supply lines within Ukraine. If they cant find any of those, they will use them against Ukrainian civilian targets. The target is not essential because the point of this attack will be to destroy Western will to continue supporting Ukraine, not to directly reverse the military situation. They would additionally put their strategic nuclear forces on alert and begin unusual movements of nuclear assets in an effort to warn the United States against responding to the attack.
The United States government has certainly considered this contingency, which is why both National Security Advisor Jake Sullivan and Secretary of State Antony Blinken were recently dispatched to warn the Russians they would suffer horrific and catastrophic consequences if they used nuclear weapons in Ukraine. In the event, however, the U.S. government will struggle to find a response that reflects the gravity of the Russian use of nuclear weapons but does not represent further escalation toward direct confrontation and all-out nuclear war.
The American equivalent of the Russian genius will argue that a direct, proportionate response aimed at the attack itself will send a signal to the Russian leadership that the United States is seeking to punish the crime of nuclear use, not escalate the war or overthrow the Russian regime. They will see the Russian strategic nuclear alert as a bluff, arguing that to follow through with a strategic nuclear attack would be suicide. Lacking better options, the U.S. leadership will seize on the idea of such a finely calibrated response and launch a conventional NATO attack on Russian troop formations in Ukraine or the military base in Russia where the Russian nuclear strike originated from. As a precaution, they will also put U.S. nuclear forces on alert, put more U.S. nuclear submarines to sea and recommend to the British and French that that they also put their forces on alert if these two independent powers had not done so already.
Unfortunately, such a subtle message is likely to be lost on a paranoid Kremlin. They will see a direct NATO attack on Russia or Russian forces as confirmation of their view that the West intends to destroy the Russian regime and kill all its leaders. For Russian leaders this is an ever-present reality: Putin reportedly obsessively watches the video of Libyan leader Muammar Qadhafis death after he was overthrown by NATO forces. Facing the prospect of death if they do not act to save their regime, Russian leaders will risk launching further conventional and tactical nuclear strikes on NATO troop formations and Ukrainian supply operations in bordering NATO states such as Poland and Estonia to signal that Russia is willing and able to defend itself despite the risk of strategic nuclear escalation.
The attacked NATO states will invoke Article 5 and NATO will begin a conventional operation to eliminate Russias offensive capability to make such attacks. Fearing that those attacks will destroy the Russian strategic nuclear capability and thus leave them defenseless against NATO conventional forces, the Russians will launch a first-strike strategic nuclear attack on the slim hope that it will weaken the Western resolve or capability to respond and save their regime. I will then have something in the order of a few minutes to send out an email to my colleagues saying, I told you so.
This is only a scenario. None of it is inevitable, of course. But this is the path that we are currently on and the likelihood of it coming to pass grows by the day as one side or the other becomes more desperate. The consequences of this path are deeply ruinous. It should be named.