Ukraine's president Volodymyr Zelensky hasin a video addressrefuted Russian claims that chemical weapons or weapons of mass destruction were developed in Ukraine. He also warned that Russia would get "the most severe sanctions response" if it were to use such weapons against Ukraine.
The UN will hold an emergency meeting on Friday, at Russia's request, to discuss their unproven claims.
His comments echo what the US said earlier: that Russia's claims of Ukraine hosting US-backed chemical weapons facilities is a "false flag", intended to justify Russia's possible use of such weapons.
Meta, the company that owns Facebook and Instagram, said it would suspend rules banning violent speech in order to allow users in certain countries to call for the deaths of Russian soldiers.
More western companies have cut ties with Russia, including Western Union, JPMorgan Chase and Warner Music on Thursday.