US President Joe Biden has urged Russian President Vladimir Putin to not use tactical nuclear or chemical weapons after a series of military losses in Ukraine.

Asked by an American reporter with the show 60 Minutes on US network CBS what he would say to Putin if he considered using such weapons, Biden said: “Don’t. Don’t. Don’t. It would change the face of war unlike anything since World War II.”

Ukraine’s military drove back Russian forces in a lightning rout in the northeast of the country last week, putting Putin under pressure from nationalists at home to regain the initiative.

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