Sergei Skripal and his daughter were found unconscious following an alleged nerve agent attack in Salisbury in UK in March. Britain blamed Russia for the attack. Moscow retaliated in kind.
Britain says Yulia and her father, Sergei Skripal - a former Russian spy - were poisoned with a nerve agent. London blames Moscow for the attack. Russia denies the allegation which has plunged relations with the West to a post-Cold War low.
Russia last week ordered 60 US diplomats to leave the country in tit-for-tat retaliation over the alleged nerve-agent poisoning of an ex-Russian spy and his daughter in Britain. Meanwhile, Russian foreign minister has called the poisoning "staged".
Scores of foreign ambassadors receive notices to leave the country, in a move that comes as retaliation for the coordinated expulsion of over 150 Russian diplomats by the UK and its allies.
Russian ex-spy Sergei Skripal and his daughter Yulia were left critically ill in a nerve agent attack three weeks ago that most probably took place at the front door of their home in southwestern England.
The March 4 attack on the Skripals in the English city of Salisbury has provoked a major response that has seen more than 150 Russian diplomats expelled from countries around the world.
Relations between London and Moscow have crashed to a post-Cold War low after an attack on an ex-Russian spy, the first known offensive use of a nerve agent in Europe since World War Two.
The move is in reaction to Britian's earlier decision to expel 23 diplomats over the alleged use of a nerve agent against a former Russian military intelligence officer who worked for British intelligence.
Ties between the two countries deteriorate rapidly in the 10 days since Russian ex-spy Sergei Skripal and his daughter Yulia were attacked with a nerve agent in Salisbury, southwest England.
Russia says it won't respond to Britain's calls to explain its role in the UK spy poisoning attack until it receives samples of the chemical at the centre of the incident.
Prime Minister Theresa May said it is "highly likely" that Moscow was responsible for the poisoning of former Russian double agent Sergei Skripal and his daughter. Russia called May's statement a "circus show."
British authorities vow to respond appropriately if foreign state involvement is found to be at play in the suspected murder attempt on former Russian spy Sergei Skripal and his daughter Yulia, who fell critically ill on March 4.
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