Russia has announced it will expel 23 British diplomats in response to the expulsion of 23 Russian diplomats from Britain.
The move marks the latest development in the diplomatic spat over the poisoning of former Russian spy Sergei Skripal in Salisbury on 4 March.
The Russian Foreign Ministry announced on Saturday morning that the 23 diplomatic representatives of the British Embassy in Moscow should leave Russia within a week.
The ministry also said all activities by the British Council, the UK’s international organisation for cultural relations, would cease in Russia and that the planned reopening of the British consulate in St Petersburg would no longer go ahead.
The ministry warned that Russia could take further measures if Britain takes any more “unfriendly actions” against the country.
Shortly before the announcement, British ambassador to Russia, Laurie Bristow, was summoned to the foreign ministry for talks, where he learned of the retaliation measures.
As he left the ministry, Mr Bristow said: “This crisis has arisen as a result of an appalling attack in the UK, the attempted murder of two people using a chemical weapon developed in Russia and not declared by Russia to the Organisation for the Prohibition of Chemical Weapons (OPCW) as Russia is obliged to do under the Chemical Weapons Act.”
The retaliation from Russia comes four days after Theresa May announced that 23 Russian diplomats would be expelled from Britain after Russia missed a deadline to provide an explanation for the poisoning of Skripal and his daughter Yulia.
Russia has continued to dismiss accusations of Russian culpability for the attack and to deny possessing Novichok, the nerve agent used in the incident.