John J. Mearsheimer has well-earned reputation for prescience concerning Russia. Mearsheimer’s latest, from foreignaffairs.com at archive.pv:
The Underappreciated Risks of Catastrophic Escalation
Western policymakers appear to have reached a consensus about the war in Ukraine: the conflict will settle into a prolonged stalemate, and eventually a weakened Russia will accept a peace agreement that favors the United States and its NATO allies, as well as Ukraine. Although officials recognize that both Washington and Moscow may escalate to gain an advantage or to prevent defeat, they assume that catastrophic escalation can be avoided. Few imagine that U.S. forces will become directly involved in the fighting or that Russia will dare use nuclear weapons.
Washington and its allies are being much too cavalier. Although disastrous escalation may be avoided, the warring parties’ ability to manage that danger is far from certain. The risk of it is substantially greater than the conventional wisdom holds. And given that the consequences of escalation could include a major war in Europe and possibly even nuclear annihilation, there is good reason for extra concern.
To understand the dynamics of escalation in Ukraine, start with each side’s goals. Since the war began, both Moscow and Washington have raised their ambitions significantly, and both are now deeply committed to winning the war and achieving formidable political aims. As a result, each side has powerful incentives to find ways to prevail and, more important, to avoid losing. In practice, this means that the United States might join the fighting either if it is desperate to win or to prevent Ukraine from losing, while Russia might use nuclear weapons if it is desperate to win or faces imminent defeat, which would be likely if U.S. forces were drawn into the fighting.