British Foreign Secretary Boris Johnson has said the United Kingdom government believes it "overwhelmingly likely" that Russian president Vladimir Putin ordered the nerve agent attack in England on a former double agent.
The Foreign Secretary was speaking during a visit to the Battle of Britain Bunker museum in his Uxbridge constituency with his Polish counterpart Jacek Czaputowicz, who said: "We are sure that it is the Russian state which is involved in this attempt".
Russian Federation is expected to take retaliatory measures soon.
Britain this week ordered the expulsion of 23 Russian diplomats and cancelled high-level bilateral contact with the Kremlin.
The quartet wrote "there is no plausible alternative explanation" except Russian responsibility for the attack on British soil, and the Kremlin's failure to respond to a "legitimate request" for an explanation "further underlines its responsibility".
He said his country had no motive to target Skripal, but suggested others could use the poisoning to "complicate" the World Cup.
President Vladimir Putin has launched a televised appeal for Russians to vote in the upcoming presidential elections, warning those that fail to vote that the decision will be made without taking their opinion into account. "We have not raised any tensions in our relations, it was the decision by the British side without evidence".
"We do not see that yet". They remain in a critical condition.
Russian foreign ministry spokeswoman Maria Zakharova accused Britain of refusing to "grant access to Russian citizen (Yulia) Skripal" or to work with Moscow through the OPCW and give Russia access to the poisonous substance.
Johnson stressed the government's "quarrel" was with President Vladimir Putin rather than the Russian people.
Roman Udot of the group Golos said in online statements Thursday that it signed a deal and paid for a call center, but the landlords rescinded the deal under pressure from government security officers.
By Friday morning, 33 Labour MPs had signed a parliamentary motion blaming the Russian state "unequivocally".