Moscow considers Britain's stance in the conflict over the poisoning of a former spy in southern England as "irresponsible" and is preparing to retaliate over London's measures against it, Kremlin spokesman Dmitry Peskov said on Thursday.
Russian Federation denied any involvement and Foreign Minister Sergei Lavrov accused London of behaving in a "boorish" way, adding that this was partly due to the problems Britain faces over its planned exit from the European Union next year.
British Prime Minister Theresa May, on March 14, held Russia responsible for the nerve agent attack against a former Russian spy and his daughter as she expelled 23 Russian diplomats and suspended high-level bilateral contact.
As the global scandal gathers pace, Skripal and his daughter remain in critical condition after exposure to the Soviet-designed chemical Novichok on March 4 in the southwestern English city of Salisbury.
The Prime Minister announced that Britain will expel 23 Russian diplomats, saying they have one week to leave the UK.
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It is a European issue
Jens Stoltenberg, secretary-general of the US-led North Atlantic Treaty Organisation alliance, said the attack was "horrendous". Other sticking points will be avoiding a hard border in Ireland, as well as securing citizens' rights.
"We, the leaders of France, Germany, the United States and the United Kingdom, abhor the attack that took place against Sergei and Yulia Skripal in Salisbury, UK, on March 4, 2018", a joint statement said.
Her comments followed a statement by British Prime Minister Theresa May on Wednesday during which May said London would kick out the Russian diplomats in the biggest such expulsion since the Cold War.
He said his country had no motive to target Skripal, but suggested others could use the poisoning to "complicate" the World Cup.
Peskov on Thursday said Russian President Vladimir Putin would ultimately choose the option that "most suits Moscow's interests".