The United States and its European allies are expelling dozens of Russian diplomats in a co-ordinated response to the poisoning of a former Russian spy in the UK.

US President Donald Trump has ordered 60 Russian diplomats to leave the country.

Germany, France, Ukraine, Canada and various European countries have also expelled envoys.

Britain has already expelled 23 Russian diplomats, accusing them of being undeclared intelligence agents, which led Russia to expel the same number of British diplomats.

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The European Union has already recalled its ambassador to Russia.

Russia called the moves a "provocative gesture" and vowed to retaliate.

Russia denies any role in the attack on Sergei Skripal and his daughter, Yulia, in Salisbury, southern England. The pair remain in a critical but stable condition in hospital.

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