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A senior Ukrainian official tells CNN a phone call between President Biden and Ukrainian Zelensky “did not go well” as tensions continue to rise over a possible Russian invasion. A national security source disputed that claim and said the call was “long and serious” but “productive.” CNN’s Chief White House Correspondent Kaitlan Collins tells Anderson Cooper one thing is clear: nobody inside the White House knows what Putin is going to do.

Plus, Supreme Court Justice Stephen Breyer officially announced his plans to retire after nearly 30 years on the bench. Biden said he expects to pick a nominee by the end of February who will be “worthy of Justice Breyer’s legacy of excellence and decency.”  Judge Vince Chhabria is a former law clerk for Justice Breyer. He joins AC360 to discuss the “giant” shoes his successor will have to fill.

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