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.
It is said to be the largest collective expulsion of Russian intelligence officers in history.
Prime Minister Theresa May said 18 countries have aligned with the UK, expelling more than 100 diplomats.
Russia vowed to retaliate to the “provocative gesture”.
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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EU leaders agreed last week it was highly likely Russia was behind the nerve-agent poisoning.
Mrs May said: “President Putin's regime is carrying out acts of aggression against our shared values and interests within our continent and beyond.
“And as a sovereign European democracy, the United Kingdom will stand shoulder to shoulder with the EU and with Nato to face down these threats together.”
Foreign Secretary Boris Johnson also praised the “extraordinary international response” by the UK's allies.
rubbish and idiocy. More like UK Home Office or CIA did it as Sergei was unhappy in England- a spy’s life is rift with enemies all capable of murdering the spy. The truth is Nato and US want a war- well go now get real stupid and lose to Russia. You cannot defeat Russia now. May and Johnson ought to show maturity and diplomacy- where is the evidence? you cannot make the world hate Putin. There is no democracy in EU, US, or England- stop pretending you are “democracy” ; we are not as stupid as you are. let’s investigate the HJome Office for the proble poisoning of an unhappy turn coat spy who longed for Russia as Putin has brought back from the edges of disaster.