Russia’s false accusations that Kyiv has biological and chemical weapons illustrate that Russian President Vladimir Putin is considering using them himself in his war against Ukraine, U.S. President Joe Biden said, without citing evidence, writes Reuters.

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.

“They are also suggesting that Ukraine has biological and chemical weapons in Ukraine. That"s a clear sign he"s considering using both of those”.

Biden also said Russia used a hypersonic missile to destroy a weapons depot on Saturday “because it’s the only thing they can get through with absolute certainty”.

An administration official clarified that Biden was confirming Russia’s use of such an advanced missile, but noted that the impact of the attack was unknown. One senior U.S. defense official had earlier raised questions about the legitimacy of the Russian account.

The Russian embassy in Washington did not immediately respond to a request for comment.