C.I.A. Director Airs Concern That Putin Might Turn to Nuclear Weapons

The director of the C.I.A. said on Thursday that “potential desperation” to extract the semblance of a victory in Ukraine could tempt President Vladimir V. Putin of Russia to order the use of a tactical or low-yield nuclear weapon, publicly discussing for the first time a concern that has coursed through the White House during seven weeks of conflict.

The director, William J. Burns, who served as American ambassador to Russia and is the member of the administration who has dealt most often with Mr. Putin, said the potential detonation of such a weapon — even as a warning shot — was a possibility that the United States remained “very concerned” about. But he quickly cautioned that so far, despite Mr. Putin’s frequent invocation of nuclear threats, he had seen no “practical evidence” of the kinds of military deployments or movement of weapons that would suggest such a move was imminent.

“Given the potential desperation of President Putin and the Russian leadership, given the setbacks that they’ve faced so far, militarily, none of us can take lightly the threat posed by a potential resort to tactical nuclear weapons or low-yield nuclear weapons,” Mr. Burns said during a question-and-answer session following a speech he delivered at the Georgia Institute of Technology.