Russia's Investigative Committee said on Friday it had opened a criminal investigation into the attempted murder of Yulia Skripal, daughter of former double agent Sergei Skripal, and what it said was the murder of another Russian in Britain.
Yulia Skripal was a Russian citizen, the Investigative Committee said in a statement.
It said it was also investigating what it called the murder in Britain of Nikolai Glushkov, 68, an associate of late Russian tycoon Boris Berezovsky.
Russian investigators said in the same statement they were ready to cooperate with their British counterparts.
A Kremlin spokesman said on Friday that there was no clear proof that Russia is linked to the attack involving a nerve agent against Sergei Skripal and his daughter Yulia who both remain in critical condition in hospital after being found unconscious on a bench in the English city of Salisbury on March 4.
Dmitry Peskov was commenting on US President Donald Trump's suggestion that there was.
"It's obvious that there is a lack of any clear proof (of Russian involvement)... The whole wave (of such statements) originated from Britain," the state-run RIA news agency quoted Peskov as saying.
Russia has repeatedly denied any involvement in the attack.
Britain, the United States, Germany and France jointly called on Russia on Thursday to explain the attack. Trump, echoing the British government, said it looked as though Moscow was behind the attack.
Source(s): Reuters