The Trump administration’s Nuclear Posture Review calls for expanding nuclear options to include low-yield nuclear weapons. While there may be any number of good reasons for these force-structure adjustments , the proximate cause appears to be a desire to deter the Russian government from what many in Washington believe to be a lowered nuclear threshold. This line of thinking runs the risk of misunderstanding the context within which the Russian government would use nuclear weapons and likely overestimates our ability to signal anything meaningful to the Russians in a scenario where Moscow is deliberating nuclear first use. Threatening the use of nuclear weapons to deter the Russian use of smaller-yield nuclear weapons will, in all likelihood, be ineffective.
United States and Western commentary on Russian nuclear doctrine often focuses on Russia’s intention to use low-yield nuclear weapons in a conventional conflict, raising the stakes for the West. The implication is that Russia has lowered its nuclear threshold. The NPR states that Russia’s belief in the coercive credibility of its lower-yield nuclear weapons is mistaken and that correcting this perception is a strategic imperative . It’s important to first correct some thinking about thresholds.
A threshold can be best understood as a set of conditions that, when met, trigger some sort of action. In the case of Russian nuclear thresholds, the conditions most frequently cited are when the Russian Federation is facing an existential threat to the state, including a threat from an overwhelming conventional force. The Russian leadership, according to a reading of its published official documents , hasn’t really lowered or raised the nuclear threshold in recent times. What people are misunderstanding is that policymakers in both Russia and the United States have different notions about the conditions under which a conflict meets the nuclear threshold that the Russian leadership is talking about.
The two most important drivers in this scenario, from the Russian perspective, are a belief in the conventional superiority of the United States and U.S. intent toward Moscow in any conflict between Russia and the United States. While the Russian military has been pursuing an aggressive modernization program of its armed forces, with varying degrees of success, its military leaders recognize that Russia is not able to ultimately win a conventional war against the United States, much less the United States and NATO. It may be able to overrun many of its neighbors but, in the end, U.S. conventional forces will be able to drive to Russia’s doorstep.
Once on that doorstep the Kremlin will understand U.S. intent in only one way— regime change . The Russian leadership have long believed that the United States seeks to weaken, contain, and eventually bring about regime change in Moscow in favor of one that is more compliant with U.S. national interests. This goes back to NATO’s 1999 intervention in Kosovo, against fervent Russian objection. United States and NATO actions against Serbia convinced Russian policymakers that the United States, in pursuit of its foreign-policy goals, would not take Russian national-security concerns into account.
Furthermore, Moscow witnessed the color revolutions in Europe and the Arab Spring and walked away with one conclusion, given the opportunity, the United States would do the same to Russia. The Russian leadership will assume that in any conflict where the United States is winning and able to threaten the Russian homeland, the United States will be seeking regime change, regardless of any U.S. statements to the contrary. These are the conditions under which the Russian leadership would likely assess that there is an existential threat to the state and employ smaller-yield nuclear weapons, whether in a demonstration strike or against military forces. And the message would be clear, the United States needs to withdraw its forces and back down.
The supplement of new, smaller-yield nuclear weapons envisaged by the NPR is intended to deter this very behavior. Given Russian intent to use nuclear weapons, the United States could signal that it is also willing to go down this path and use nuclear weapons in a limited way, convincing the Russians that they cannot escalate their way out of the conflict. This completely misinterprets the situation.
Deterrence is about affecting adversary behavior. Remember that the Russians, in this scenario, think they are on the verge of defeat. Signaling or using nuclear weapons may be the only way, from their perspective, that they can survive and get the United States to back down from regime change. It is extremely difficult, if not impossible, to deter someone from an action they believe is critical to their survival. If the United States did decide to use nuclear weapons in response to Russian use, then it would likely fail to deter additional Russian nuclear strikes or convince the Russian government to back down. To borrow some military sarcasm about bad situations, nukes will continue until morale improves, i.e. until the threat of regime change is gone.