Russia said today it would expel 23 British diplomats and close a British consulate following London's "provocative" measures over the poisoning of a double agent that has triggered a fierce diplomatic row.
Moscow also said it would halt the activities of the British Council in Russia in a tough series of retaliatory measures announced after it summoned British ambassador Laurie Bristow.
Prime Minister Theresa May responded defiantly to the tit-for-tat move, which followed Britain's expulsion of 23 Russian diplomats and the suspension of high-level contacts earlier this week.
Amid escalating tensions with Moscow over the nerve agent attack on Sergei Skripal and his daughter Yulia in the English city of Salisbury on March 4 , May warned she would "never tolerate a threat to the life of British citizens and others on British soil from the Russian government," to strong applause from party members.
"Russian aggression is the very antithesis of the liberal and democratic values that define the United Kingdom," she said.
She also repeated accusations made by Britain to the United Nations that the poisoning was a "flagrant breach of international law and the Chemical Weapons Convention."
The Russian response was announced on the eve of a presidential election which is expected to hand Vladimir Putin a fourth term in the Kremlin, but which comes as the country appears increasingly isolated.
The crisis erupted after the Skripals were exposed to a Soviet-designed military grade nerve agent, leaving them in critical condition.
London and its allies have blamed Moscow for the attack and on Friday, Britain directly implicated Putin himself, unleashing the Kremlin's fury.
"Twenty three diplomatic staff at the British embassy in Moscow are declared persona non grata and to be expelled within a week," a foreign ministry statement said.
It said this was a response to Britain's "provocative actions" and "baseless accusations over the Salisbury incident.
Russia also said it was closing Britain's consulate in the city of Saint Petersburg, citing a "disparity" in the number of diplomatic missions held by the two countries.
And it said it had halted the activities of the British Council, Britain's international organisation for cultural relations and educational opportunities.
The organisation said it was "profoundly disappointed" at the move.
The Russian ministry also warned Britain that it "retains the right to take other answering measures" in response to any "further unfriendly actions."
"The measures are more harsh, but the British deserved them. And I don't rule out that something else could follow," first deputy head of the Russian Senate's foreign affairs committee Vladimir Dzhabarov told Interfax news agency.
In a similar move, Russia closed the British Council's regional offices in 2008 after relations nosedived over the poisoning of former Russian agent Alexander Litvinenko.
The Russian dissident died of Polonium radiation poisoning in London in 2006 in an attack that Britain also blamed on Russia.
Russia insists it had no motive to target Skripal with what Britain says was a highly-potent nerve agent called Novichok, in the first such attack in Europe since World War II.
On Friday, Kremlin spokesman Dmitry Peskov said statements by British Foreign Secretary Boris Johnson tying Putin to the attack were "shocking and unforgivable".
Western leaders have strongly backed Britain's response.
EU leaders are to discuss the incident at a Brussels summit next week and it is also on the agenda for talks on Monday between Johnson, his EU counterparts and NATO Secretary General Jens Stoltenberg.
Following the Salisbury incident, the British government has also pledged to re-examine 14 deaths on UK soil following a report that they could have been carried out by Moscow or the Russian mafia.
On Friday, police said they were treating the March 12 death of exiled businessman Nikolai Glushkov as murder after a post-mortem found he died from "compression to the neck".
Glushkov was an associate of the late Kremlin opponent Boris Berezovsky, a one-time Putin supporter who then turned against him.
Berezovsky was found hanged in a bathroom at his home outside London in 2013.
Main Russian opposition leader Alexei Navalny, meanwhile, on Saturday demanded justice for assassinated Putin critic Boris Nemtsov.
He said he wanted "those who organised his murder to be held responsible", speaking in front of the building where he lived.
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