US President Joe Biden and his Russian counterpart Vladimir Putin will speak on Saturday as the United States and other Western nations warned a war in Ukraine could ignite at any moment.
Washington ordered some embassy staff to leave Ukraine on Saturday, following its call this week for citizens to leave the country as soon as possible.
Putin requested the telephone call between the leaders to take place on Monday, a White House official said, but Biden wanted to conduct it sooner as Washington detailed increasingly vivid accounts of a possible attack on Ukraine.
Australia, New Zealand, Germany and the Netherlands on Saturday joined countries urging their citizens to leave Ukraine. Washington said on Friday that a Russian invasion, including a possible air assault, could occur anytime.
Moscow has repeatedly disputed Washington's version of events, saying it has massed more than 100,000 troops near the Ukrainian border to maintain its own security against aggression by NATO allies.
Russia, which has accused Western nations of spreading lies, meanwhile said on Saturday it had decided to "optimise" its diplomatic staff numbers in Ukraine, fearing "provocations" by Kyiv or another party.
Moscow did not say whether that meant a reduction in staff numbers but said the embassy and consulates in Ukraine continued to perform their key functions.
U.S. Secretary of State Antony Blinken said Washington would impose swift economic sanctions if Moscow invades.
"I continue to hope that he will not choose the path of renewed aggression and he'll chose the path of diplomacy and dialogue," Blinken told reporters after a meeting with Pacific leaders in Fiji. "But if he doesn't, we're prepared."
In a phone call later with Blinken, Russia's top diplomat Sergei Lavrov accused the United States and its allies of waging a "propaganda campaign" about Russian aggression towards Ukraine, the Russian foreign ministry said.
German Foreign Minister Annalena Baerbock said on Saturday that the crisis between Russia and Ukraine was escalating, but Germany was making all efforts to find a diplomatic solution.
Putin, jostling for influence in post-Cold War Europe, is seeking security guarantees from Biden to block Kyiv's entry into NATO and missile deployments near Russia's borders.
Washington regards many of the proposals as non-starters but has pushed the Kremlin to discuss them jointly with Washington and its European allies.
Still, Biden, who will join the weekend call from the presidential retreat in Camp David, Maryland, has long believed that one-on-one engagement with Putin may be the best chance at a resolution.
Two calls in December between Biden and Putin produced no breakthroughs but set the stage for diplomacy between their aides. The two leaders have not spoken since, and diplomats from both sides have struggled to find common ground.
Four-way talks in Berlin between Russia, Ukraine, Germany and France on Thursday made no progress.
Putin also plans to speak with French President Emmanuel Macron on Saturday, according to Russia's TASS news agency.
Biden's national security adviser, Jake Sullivan, told reporters on Friday that U.S. intelligence believes a rapid assault on Kyiv is possible and that Putin could order an invasion before the Winter Olympics in China end on Feb. 20. He added that it remains unclear whether such a command has been given.
He said the Russians had gathered sufficient troops near the border to invade the country and that they may initiate an aerial bombing.
On Twitter, Russia's Deputy U.N. Ambassador Dmitry Polyanskiy accused Washington of mounting a "panic campaign".
Ukrainian officials have tried to tamp down Washington's assessment an invasion could be imminent and the Foreign Ministry urged citizens on Saturday to remain calm.
Still, Washington planned to send 3,000 extra troops to Poland, Ukraine's western neighbor, in coming days to try and help reassure NATO allies, four U.S. officials told Reuters. They are in addition to 8,500 already on alert for deployment to Europe if needed.
Meanwhile, Russian forces gathered north, south and east of Ukraine.
More than 30 ships from the Russian Black Sea fleet have started training exercises near the Crimea peninsula as part of wider navy drills, RIA news agency reported on Saturday.
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