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Russia demanded on Saturday that Britain further slash its diplomatic presence as a crisis in ties between Moscow and the West escalated after a nerve agent attack on a former spy.
The call came after 23 British diplomats were kicked out of Russia last month and is seen as Moscow's retaliation to the mass coordinated expulsion of Russian diplomatic staff by the UK's allies.
It is the biggest wave of tit-for-tat expulsions between Russia and the West in recent memory and has seen relations plunge to post-Cold War lows.
The crisis was triggered by the March 4 poisoning of Russian former double agent Sergei Skripal and his daughter Yulia in the English city of Salisbury. Britain blamed this on Moscow, saying a military grade nerve agent of a kind developed in Russia was used.
On Friday, Moscow summoned British ambassador Laurie Bristow, giving London a month to cut the number of diplomatic staff in Russia to the same number Russia has in Britain.
"Russia suggested parity. The British side has more than 50 more people," foreign ministry spokeswoman Maria Zakharova told AFP.
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Read more:
[ Russia targets UK in new round of envoy cuts ]
[ Putin hits back over Skripal expulsions by closing US consulate in St Petersburg ]
[ Poisoned Russian spy's daughter 'improving rapidly' ]
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Mr Bristow was summoned along with the heads of missions from 23 other countries who were told that some of their diplomats had to leave.
He was handed a protest note over the "provocative and unfounded actions of the British side which instigated the unwarranted expulsion of Russian diplomats from a variety of states," the Russian foreign ministry said.
In London, a Foreign Office spokeswoman said on Saturday: "We are considering the implication of the measures announced yesterday by the Russian Foreign Ministry."
The UK Foreign Office had said it regretted the most recent developments but insisted Russia was the culprit.
"This doesn't change the facts of the matter: the attempted assassination of two people on British soil, for which there is no alternative conclusion other than that the Russian state was culpable," it said.
Meanwhile, Britain said it was considering Moscow's request for consular access to Skripal's daughter Yulia, who was visiting from Russia when the attack took place.
The 33-year-old came out of critical care on Thursday and was "improving rapidly", according to Salisbury District Hospital.
She is now in a stable condition – with the BBC reporting that she was conscious and talking.
"We are considering requests for consular access in line with our obligations under international and domestic law, including the rights and wishes of Yulia Skripal," a Foreign Office spokeswoman told AFP.
Sergei Skripal, 66, who sold secrets to Britain and moved there in a 2010 spy swap, remains in a critical but stable condition.
Britain also acknowledged on Saturday that border officials had searched an incoming Aeroflot flight from Moscow in what Russia called a "blatant provocation".
Britain said it conducts routine checks on aircraft to protect the UK from organised crime and people attempting to bring harmful substances into the country.
The crisis has resulted in more than 150 Russian diplomats leaving the US, EU member states, Nato countries and other nations.
On Friday, Russia expelled diplomats from 23 countries – most of them EU member states – in retaliation against the West.
France, Germany, Canada and Poland each said that Russia was expelling four of their diplomats. Other countries including Australia, Ukraine, the Netherlands, Sweden, the Czech Republic, Finland, Lithuania and Norway were also told to pull out their envoys.