US President Joe Biden assured his Ukrainian counterpart Volodymyr Zelensky in a phone call Sunday that the United States and its allies "
will respond vigorously
" if Russia invades Ukraine, the White House said.
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White House spokeswoman Jen Psaki also said Joe Biden had shown his support for diplomatic efforts, including talks scheduled for January 9-10 in Geneva between high-level US and Russian officials.
Joe Biden, who multiplies the warnings to Vladimir Putin and pleads for a "
de-escalation
", assured to have again warned the Russian president against an attempted invasion of Ukraine during a telephone interview Thursday.
"
I made it clear to President Putin that we would adopt severe sanctions and that we would increase our presence in Europe, among our NATO allies
," Joe Biden said on Friday.