President Joe Biden again ruled out any direct intervention by the United States to halt Russia's invasion of Ukraine on Friday, warning that such conflict will set NATO alliance against Russia "is World War III."
"We will not fight a war against Russia in Ukraine," Biden said in a speech at the White House.
US President Joe Biden on Friday said the United States will revoke Russia's "permanent normal trade relations" status to punish Moscow over its invasion of Ukraine.
Russia makes claims of US biological weapons activities in Ukraine at a meeting of the UN Security Council.
The US has called such claims "laughable", and says they are a "false flag" to justify Russia's potential use of similar weapons against Ukraine
US ambassador to the United Nations Linda Thomas-Greenfield tells the UN Security Council: “Ukraine does not have a biological weapons programme.
"There are no Ukrainian biological weapons laboratories supported by the United States. Not near Russia’s border or anywhere”.
Russia has a well-documented history of using chemical weapons.
Thomas-Greenfield says the US “has serious concerns that Russia may be planning to use chemical or biological agents against the Ukrainian people”.
She also says she believes Russia could use chemical or biological agents “for assassinations as part of a staged or false flag incident, or to support tactical military operations".
Meanwhile, Russian President Vladimir Putin has given his support to plans to send volunteer fighters to help Russia-backed forces in Ukraine.