The UK and America are accusing Russia of lying to justify a possible chemical attack in Ukraine.
Moscow claims the US is developing biological weapons there - leading to an emergency United Nations meeting being called for today.
On the ground. a US official says in the last 24 hours a huge convoy of Russian tanks has moved even closer to the capital, and is now less than 10 miles away.
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The owner of Facebook and Instagram - Meta - is changing its policy towards violent speech because of the war.
People in some countries can now call for the death of President Putin, which would normally be blocked.
Alyona Shkrum is a lawyer and member of Ukraine's Parliament.
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She thinks Vladimir Putin should be put on trial for war crimes:
