US President Joe Biden said that at the beginning of the crisis in Ukraine he faced a task of avoiding a war between two nuclear powers,reported from TASS.

"I had two jobs: One to rally the world and defend Ukraine, and the other is to avoid war between two nuclear powers. We did both those things today," he said as he delivered a final foreign policy speech at the US State Department.

Biden spoke a week before transferring power to his successor Donald Trump.

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