Russia: "The Russian side reserves the right to take further retaliatory measures"

The White House said it shared Britain's assessment that Russia was responsible and supported the decision to expel Russian diplomats.

The Russian Foreign Ministry said it was giving the 23 British diplomats one week to leave the country.

The actions are prompted by the attempted poison assassination, and are likely also prompted by another recent event - a former KGB agent, Andrey Lugovoy, has been linked to a dead Russian businessman who was found in London with "strangulation marks" on Monday; the former agent is also accused of poisoning Russian defector Alexander Litvinenko with polonium.

London's Metropolitan Police later announced their own murder investigation, saying Glushkov he had suffered compression of the neck.

Russian Federation also suspects foul play in Glushkov's death and opened its own inquiry Friday.

She warned more measures could follow, noting that the US-led North Atlantic Treaty Organisation alliance and the UN Security Council had discussed the attack, while it was also expected to be on the agenda of the European Union summit next week. Her father has British citizenship. They disclose that a police officer who responded to the incident is in serious condition in a hospital. "Extreme concern was expressed in connection with the destructive and provocative position taken by the British side", he said.

"Russia perceives the position taken up by United Kingdom authorities with great bewilderment and incomprehension..."

Speaking to reporters Thursday, President Donald Trump said that he had spoken with U.K. Prime Minister Theresa May, and "it certainly looks like the Russians were behind it".

The first use of a nerve agent on European soil since World War II is a direct challenge to the Western alliance, days before elections are nearly certain to give Putin a fourth term as president. Peskov reiterated Russian denials of involvement in the attack on the Skripals.

Moscow and London have both ordered diplomats to be expelled in the deepening dispute.

Lithuanian Foreign Minister Linas Linkevicius told The Associated Press that the Salisbury attack was a direct challenge to Europe.

British ambassador to Russia, Laurie Bristow, leaves after a meeting at the Russian foreign ministry building in Moscow, Russia, Saturday, March 17, 2018.

The source of the nerve agent - which Britain says is Soviet-made Novichok - is unclear, as is the way it was administered.

Russian Federation has repeatedly asked Britain to supply a sample of the nerve agent.

The US is among several countries backing British claims that Moscow was to blame. Russian Federation has said it will reply in kind.

Russian Federation has also backtracked on giving permission for Britain to open a general consulate in St Petersburg.

Former military intelligence agent Sergei Skripal had been pardoned and was "no longer a threat to Russia", Nebenzia argued, but at the same time, he could clearly serve as "the ideal victim who could justify any unthinkable lie, any kind of untruth tarnishing Russia".

  • Rogelio Becker