But only days before Sunday's presidential election, in which Vladimir Putin is expected to retain the top office, prominent Putin opponent Alexei Navalny has said that Britain has not gone far enough.
The attack marks the first known use of the substance that was developed by the Soviet military since World War II and has marked a new low in relations between Britain and Russia in the post-Cold War era.
Russia also blamed the UK for the deaths of other former spies on British soil.
"Fortunately that is not the case, and we will support the UK, but Russia acts by testing for reactions".
Russia today retaliated, announcing it will remove British diplomats from its ranks and the British position was irresponsible. It amounts to "a breach of international law".
"You know how many oligarchs find safe haven in London - their money, the real estate, the children sent to secondary schools - and they cannot imagine their life without that", he said. Mirzayanov said he revealed the existence of Novichok because he thought it was necessary to deprive Russia of its "deadly secret".
Russia denies any involvement in the incident.
The source of the nerve agent - which Britain says is Soviet-made Novichok - is unclear, as is the way it was administered. She also tied the attack to the use of chemical weapons in Syria.
"Russia is always looking for weak points, and may feel the UK does not feel very strong", he told the Guardian.
"The U.K. thoroughly briefed its allies that it was highly likely that Russia was responsible for the attack", the statement said.
Lavrov said Moscow had stopped paying attention to Britain over the spy poisoning allegations.
The foreign secretary said "our quarrel is with Putin's Kremlin, and with his decision" over the nerve agent attack.
They include Moscow's intelligence services, a propaganda organisation and businessman Evgeny Prigozhin, one of 13 Russian nationals charged with interfering with US elections and political processes by Special Counsel Robert Mueller.
Russian investigators offered some cooperation to British authorities after the 2006 London murder of ex-KGB agent Alexander Litvinenko too.
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