Ukraine crisis updates: What to know amid the fears of war

High-stakes diplomacy continues to try to avert a war in Eastern Europe

WARSAW, Poland -- High-stakes diplomacy continued on Friday in a bid to avert a war in Eastern Europe. The urgent efforts come as 100,000 Russian troops are massed near Ukraine's border and the Biden administration worries that Russian President Vladimir Putin will mount some sort of invasion within weeks.

Here are things to know about the international tensions surrounding Ukraine.

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A DIPLOMATIC DEADLOCK