The evidence, May noted, shows that both are active officers in Russia's military intelligence, the GRU.
"This was not a rogue operation".
In a joint statement, the leaders of Germany, France, Canada and the U.S. said they had "full confidence in the British assessment" that the Russian state was behind the poisoning of a former Russian spy in England earlier this year. Police said they were aged in their 40s and had travelled on Russian passports arriving at Britain's Gatwick airport at 3pm on Friday, March 2 on Aeroflot flight SU2588 from Moscow.
"It is likely that they were travelling under aliases and that these are not their real names", he said.
Speaking before Scotland Yard's statement, the Kremlin spokesman Dmitry Peskov said Moscow had repeatedly offered to cooperate with Britain in the Skripal investigation but had been met with "either refusal or silence".
"Instead of conducting an independent, objective and transparent investigation into the incidents in Salisbury and Amesbury, London continues to engage in anti-Russian megaphone diplomacy, continuing its propaganda show", the statement added.
Police officers in forensics suits and protective masks work at the scene of the poisoning of Sergei Skripal on March 13, 2018 in Salisbury, England.
"We retaliate in our way. within the rule of law and in a sophisticated way, that they know the cost of what they do", he said.
"We stand with our partners and allies".
His response at a meeting of the United Nations security council came after Britain's ambassador Dame Karen Pierce accused Russian Federation of "playing dice with the lives" of people in Salisbury.
Around 250 detectives analysed 11,000 hours of security footage and took 1,400 statements, according to Prime Minister Theresa May.
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They have been identified as Alexander Petrov and Ruslán Boshirov (both very common Christian names and surnames in Russia).
"We will not be applying to Russia for the extradition of these men as the Russian constitution does not permit extradition of its own nationals", said Sue Hemming, director of Legal Services at the Crown Prosecution Service.
In total the men booked nearly 30 flights in and out of Moscow, mainly on Aeroflot, the Russian state carrier, but also used on one occasion Air France, KLM and a Russian budget airline from Moscow to Bergamo in Italy.
A European arrest warrant has been issued for the two Russians, the prosecutors said.
Ruslan Boshirov has a profile on a Russian social media site, My World, that was posted in July 2013.
Mrs May told the Commons on Wednesday that the two suspects had entered the United Kingdom on Russian passports.
Basu added that photos of the men were being made public in the hope that a member of the public will recognise them. "GRU officers don't stay in London hotels", he said.
They visited Salisbury the day before to carry out reconnaissance and were captured on security cameras near Skripal's house.
Mr Skripal, 66, and his daughter Yulia, 33, were poisoned with Novichok on 4 March. The suspects flew back to Moscow later that evening. They are also charged with use and possession of Novichok, contrary to the Chemical Weapons Act. In 2010 he was allowed to leave for Britain as part of a prisoner swap, but in the Kremlin's eyes he will always be seen as a traitor.
Rowley was discharged from hospitalbut Sturgess later died.
Police said they had spoken with Nina Ricci and confirmed the bottle and box were fake and say members of the public who have bought the perfume have no need to worry. They spent weeks in hospital before being discharged.