Washington, March 22 (TIWN) Russias false accusation that Ukraine has biological and chemical weapons is a "clear sign" that a desperate President Vladimir Putin is considering using them himself, US President Joe Biden said.

10 developments in the Russia-Ukraine war:
Russian accusations that Kyiv has biological and chemical weapons are false and illustrate that Russian President Vladimir Putin is considering using them himself in his war against Ukraine, U.S. President Joe Biden said on Monday, without citing evidence. Putin's "back is against the wall and now he's talking about new false flags he's setting up including, asserting that we in America have biological as well as chemical weapons in Europe, simply not true," Biden said at a Business Roundtable event.

Ukrainian President Volodymyr Zelenskiy said on Monday that it would not be possible to negotiate an end to the war in his country without meeting Kremlin leader Vladimir Putin.

Russian forces shelled along a humanitarian corridor on Monday, wounding four children who were among the civilians being evacuated, Ukrainian President Volodymyr Zelenskyy said in his nighttime video address to the nation. He said the shelling took place in the Zaporizhzhia region, the initial destination of those fleeing Mariupol.

US President Joe Biden on Monday warned U.S. companies that Russia could be preparing to launch cyberattacks against critical infrastructure amid the war in Ukraine.

A senior U.S. defense official says the Russians have increased the number of military aircraft sorties over Ukraine over the past two days, doing as many as 300 in the last 24 hours. The official said Monday that Ukraine has also increased the pace of its military flights, but declined to provide numbers.