President Biden plans to speak with President Vladimir V. Putin of Russia on Saturday in a bid to defuse the crisis over Ukraine, as the State Department ordered many U.S. diplomats to leave the American Embassy in Kyiv over fears that Moscow would soon mount a major assault.
Secretary of State Antony J. Blinken also said that he would speak with Sergey V. Lavrov, Russia’s foreign minister, on Saturday to press for Russia to pull back the land, sea and air forces it has built up on three sides of Ukraine, and to engage in diplomacy to resolve what has grown into one of the gravest security threats in Europe since the Cold War.
“We’re in the window when a Russian invasion can start at any time if President Putin so decides,” Mr. Blinken told reporters on Saturday in Fiji, where he was on a weeklong tour of the Pacific.
U.S. intelligence officials had thought Mr. Putin was prepared to wait until the end of the Winter Olympics in Beijing before possibly ordering an offensive, to avoid antagonizing President Xi Jinping of China, a critical ally. In recent days, they say, the timeline began moving up, an acceleration that Biden administration officials began publicly acknowledging on Friday.
“We continue to see signs of Russian escalation, including new forces arriving at the Ukrainian border,” Jake Sullivan, the president’s national security adviser, told reporters, adding that an invasion could begin “during the Olympics,” which are scheduled to end on Feb. 20.
U.S. officials do not know whether Mr. Putin has decided to invade, Mr. Sullivan insisted. “We are ready either way,” he said. “Whatever happens next, the West is more united than it has been in years.”
The United States has picked up intelligence that Russia is discussing next Wednesday as the target date for the start of military action, officials said, acknowledging the possibility that mentioning a particular date could be part of a Russian disinformation effort.
The combination of the Russian troop movements and the new information about a possible date helped to trigger a flurry of diplomatic activity and public warnings by the NATO allies on Friday. The Kremlin said Mr. Putin would also speak again on Saturday with President Emmanuel Macron of France.
The State Department said on Saturday that all nonemergency U.S. employees would depart the embassy in Kyiv because of the Russian military buildup, leaving only a core team of American diplomats and Ukrainian staff members. Consular services at the embassy will be suspended starting on Sunday, the department said, emphasizing that all Americans in Ukraine should leave the country immediately.
A small consular presence in Lviv, Ukraine, will be able to handle emergencies for U.S. citizens but will not be able to provide passport, visa or routine consular services, the State Department said.
“Despite the reduction in diplomatic staff, the core embassy team, our dedicated Ukrainian colleagues, and @StateDept and U.S. personnel around the world will continue relentless diplomatic and assistance efforts in support of Ukraine’s security, democracy, and prosperity,” the embassy said on Twitter.
The United States has ruled out sending troops to defend Ukraine but has increased deployments to NATO member countries in Eastern Europe, and on Friday the Pentagon ordered 3,000 more soldiers to Poland.
The White House is eager to avoid a repeat of the chaotic evacuation of the U.S. Embassy staff from Kabul last year as Afghanistan fell to the Taliban. The United States and several other countries — including Britain, Denmark, Germany, Japan, Latvia and Norway — have issued a series of increasingly urgent calls for their citizens to leave Ukraine.
Russia has accused Western countries of spreading misinformation about its intentions. On Saturday, its Foreign Ministry said it was pulling some of its diplomatic personnel out of Ukraine because it was “drawing the conclusion that our American and British colleagues seem to know about certain military actions.”
Britain’s armed forces minister, James Heappey, told Sky News on Saturday that British nationals in Ukraine should not expect a military evacuation and that they should “leave Ukraine immediately by any means possible.”