There are calls from the US and Britain for an investigation after Ukrainian soldiers of the Azov regiment were reported injured by a "poisonous substance" during another Russian assault on the port of Mariupol. There is no evidence yet gathered. The UK foreign secretary says it would be "a callous escalation" of the war. The Pentagon says it's "deeply concerning". Ukraine's president Volodymyr Zelensky has already expressed his fears that Russia could deploy chemical weapons in his country.


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