“His back is against the wall, “Biden said of Russian President Vladimir Putin, recalling that Russia recently accused the United States of stockpiling chemical and biological weapons in Europe.

“It’s just not true, I guarantee you,” he told US business leaders in Washington.

“They are also suggesting that Ukraine has chemical and biological weapons in Ukraine. That is a clear signal that he (Putin) is considering using both types (of weapons),” he stressed.

His warning echoes statements released by his administration earlier this month and to other Western nations after Russian officials accused Ukraine of trying to hide an alleged US-backed chemical weapons program.

“Now that Russia has made these false claims … we should all look closely at the possibility of Russia using chemical and biological weapons in Ukraine, or creating false flag operations using them,” the UN press secretary warned on Twitter. White House, Jen Psaki.

On Monday, Biden also reiterated that such an action would trigger a “severe” but so far undefined response from Western allies.

Putin “knows that there will be severe consequences on behalf of NATO ‘s united front, ” he said, without specifying what actions the alliance would take.

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