The Kremlin on Thursday rejected accusations by British authorities that Russian President Vladimir Putin is ultimately responsible for poisoning a former spy in England, and said Russia is not going to investigate the suspects.

Britain’s security minister on Thursday called out Putin over the nerve agent attack targeting Sergei Skripal and his daughter and also warned that the U.K. would counter Russian “malign activity” with both public and covert measures.

Ben Wallace told the BBC that Putin and his government “controls, funds and directs” the military intelligence unit known as the GRU, which Britain believes used the Soviet-developed Novichok nerve agent to try to kill ex-Russian spy Skripal.

Skripal and his daughter Yulia were hospitalized for weeks in critical condition after they were exposed to Novichok in the city of Salisbury on March 4. They are now recovering in a secret location for their own protection.

Local woman Dawn Sturgess died and her boyfriend Charlie Rowley was sickened after they came across remnants of the poison in a discarded perfume bottle in June.

Britain on Wednesday announced charges in absentia against two alleged Russian agents, Alexander Petrov and Ruslan Boshirov names that are likely aliases.

The murder attempt was approved “at a senior level of the Russian state,” British Prime Minister Theresa May said Wednesday.

Moscow strongly denies involvement in the attack, and Russian officials said they didn’t recognize the suspects.

Speaking to reporters on Thursday, Putin’s spokesman, Dmitry Peskov, called the accusations leveled against Putin and the Russian government “unacceptable.”

“Neither the Russian leadership nor its representatives have anything to do with the events in Salisbury,” he said.

Peskov also said that Russia “has no reasons” to investigate the two individuals charged on Wednesday because Britain has not asked for legal assistance in the case.

Britain has said it is not going to seek the men’s extradition because Russian law does not allow for the extradition of its nationals to be tried abroad.

Russian officials have been vehemently denying the fresh accusations.

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