Biden reassures the Ukrainian president: We will respond quickly to any Russian aggression

US President Joe Biden reassured his Ukrainian counterpart Volodymyr Zelensky of Washington's commitment to Ukraine's sovereignty and territorial integrity in a phone call on Sunday.

Biden said the United States and its partners and allies will respond quickly to any further Russian aggression against Ukraine, according to a statement from the White House.

The two leaders agreed on the importance of continuing diplomacy and deterrence in response to the Russian military build-up on the Ukrainian border.

The call came a day after Biden spoke with Russian President Vladimir Putin, as intense diplomatic efforts continue to avert war in Eastern Europe.

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