In his news conference last week, Mr. Biden said he had cautioned Mr. Putin that a Russian invasion of Ukraine would prompt Washington to send more troops to the region.
“We’re going to actually increase troop presence in Poland, in Romania, etc., if in fact he moves,” Mr. Biden said. “They are part of NATO.”
During a phone call this month, Defense Secretary Lloyd J. Austin III warned his Russian counterpart, Sergey Shoygu, that a Russian incursion into Ukraine would most likely result in the exact troop buildup that Mr. Biden is now considering.
At the time of the phone call — Jan. 6 — the Biden administration was still trying to be more restrained in its stance on Ukraine. But after unsuccessful talks between Mr. Blinken and the Russian foreign minister, Sergey V. Lavrov, on Friday, the administration is eying a more muscular posture, including not only diplomatic options like sanctions, but military options like increasing military support to Ukrainian forces and deploying American troops to the region.
“This is clearly in response to the sudden stationing of Russian forces in Belarus, on the border, essentially, with NATO,” said Evelyn Farkas, the top Pentagon official for Russia and Ukraine during the Obama administration. “There is no way that NATO could not reply to such a sudden military move in this political context. The Kremlin needs to understand that they are only escalating the situation with all of these deployments and increasing the danger to all parties, including themselves.”
Another former top Pentagon official for Russia policy, Jim Townsend, said the administration’s proposal did not go far enough.
“It’s too little too late to deter Putin,” Mr. Townsend said in an email. “If the Russians do invade Ukraine in a few weeks, those 5,000 should be just a down payment for a much larger U.S. and allied force presence. Western Europe should once again be an armed camp.”