The US President says there are clear signs Russia may be preparing to use chemical weapons in Ukraine.
Joe Biden says Vladimir Putin's "had his back to the wall" due to Ukrainian resistance - and may resort to more severe tactics.
Ukraine's President, meanwhile, says he's prepared to promise not to seek NATO membership in exchange for a ceasefire and the withdrawal of Russian troops.
President Biden says he fears Russia may turn to chemical weapons.
"His back is against the wall and he's now he's talking about new false flags he's setting up, including asserting that weed America biological as well as chemical weapons in Europe - simply not true.
"That's a clear sign he's considering using both of those."
