News Desk: US President Joe Biden restates that his country will not directly intervene militarily against Russia in Ukraine.
He warns that US forces fighting Russia would mean WW3.
Russia makes claims – without evidence – of US biological weapons activities in Ukraine at a meeting of the UN Security Council.
UN disarmament chief Izumi Nakamitsu says the UN is not aware of any biological weapons programme in Ukraine.
Ukraine has suggested Belarus could join Russia's invasion in the coming hours.
Russia has expanded its offensive in Ukraine, attacking the cities of Lutsk, Ivano-Frankivsk and Dnipro.
