The UK has warned that "all options are on the table" if claims that Russian forces used chemical weapons in an attack on the Ukrainian city of Mariupol are proven to be true.

Soldiers were left dizzy and unable to breathe after a “poisonous substance of unknown origin” was dropped on them from a Russian drone, reported the Azov Battalion - a paramilitary group with links to neo-Nazism.

The allegation of a chemical attack in Mariupol cannot yet be verified.

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