White House Warns Russian Invasion of Ukraine Could Happen at Any Time

On Friday, Mr. Biden spoke with other trans-Atlantic leaders on a call that included Mr. Scholz; Prime Ministers Boris Johnson of Britain, Mario Draghi of Italy and Justin Trudeau of Canada; and Presidents Macron, Andrzej Duda of Poland, Klaus Iohannis of Romania, Ursula von der Leyen of the European Commission and Charles Michel of the European Council; and the NATO secretary general, Jens Stoltenberg.

The leaders met for about 80 minutes, in a call that was initially supposed to be centered around “diplomacy and deterrence,” the White House said.

Gen. Mark A. Milley, the chairman of the Joint Chiefs of Staff, also spoke on Friday with his Russian counterpart as well as allied chiefs of defense about the crisis in Ukraine, military officials said.

The calls came as Russia builds up its forces in Belarus, western Russia and Crimea. Ukraine said on Friday that Russian-backed separatists were holding military exercises in the slice of eastern Ukraine they controlled, at the same time that Russia holds exercises near Ukraine.

The drills tested the separatists’ preparation for live-fire operations, practicing “driving artillery, tanks and armored vehicles” in field exercises, the Ukrainian statement said. Some units of the force, believed to number 30,000 troops, were put on their highest level of alert, the Ukrainians said, and senior Russian military officers were observing the activity.

The assessment from Kyiv was the latest evidence of a shift by officials there to more alarming commentary about the military risk facing the country. That follows weeks of efforts to minimize the threat of an invasion, seeking to calm the public, limit the economic fallout and avoid anything that could be deemed a provocation by Moscow.

“If there’s a war tomorrow, Putin has calculated that Zelensky will be blamed for not preparing for war,” Mr. McFaul said, referencing President Volodymyr Zelensky of Ukraine. “That doesn’t get a lot of attention in our press, but that’s a very big part of his strategy. Ideally, he would like to see democracy in Ukraine fall, and Zelensky personally fall.”