The motive for attacking Skripal, who was exchanged in a Kremlin-approved spy swap in 2010, is still unclear, as is the motive for using an exotic nerve agent, Novichok, which has such clear links to Russia's Soviet past.
Two Russian nationals named and charged over the novichok poisoning of Sergei and Yulia Skripal in Salisbury have been identified as officers from Russia's military intelligence, Theresa May has said, adding the attack was clearly authorised by Moscow. We have already taken action together to disrupt the activities of the GRU through the largest ever collective expulsion of undeclared intelligence officers.
British authorities and the global chemical weapons watchdog say the Skripals were exposed to Novichok, a type of military-grade nerve agent developed by the Soviet Union during the Cold War.
The men, who entered the United Kingdom under the names Alexander Petrov and Ruslan Boshirov, are being charged in absentia with conspiracy to murder, attempted murder and use of the nerve agent Novichok, prosecutors said.
The emergency session at the United Nations was called by Britain after prime minister Theresa May named two men from the GRU as suspects for the attack on Sergei Skripal and his daughter Yulia and released footage from security cameras and passports to back up their claims.
They demanded Russian Federation open its Novichok program to worldwide inspectors, urged anyone with information about the attack to speak to authorities - and vowed to disrupt "the hostile activities of foreign intelligence networks on our territories".
A senior adviser to Russian President Vladimir Putin says he doesn't know the people whom Britain named as suspects in the poisoning of a former Russia spy.
British prosecutors have charged the two Russian men with the nerve-agent poisoning of ex-spy Sergei Skripal and his daughter Yulia.
Moscow strongly denies involvement in the attack, and Russian officials said they didn't recognize the suspects.
"Neither Russia's top leadership nor those in the ranks below, nor any official representatives have anything to do with the events in Salisbury", Peskov said.
In response to the incident, London in March expelled 23 Russian diplomats believed to be intelligence agents.
Foreign Ministry spokeswoman Maria Zakharova went on national television Wednesday evening, claiming that the security camera footage of the two suspects arriving at Gatwick Airport released by the British authorities has been doctored because it shows them at the same time in the same place.
The order to carry out the Salisbury nerve agent attack came from the "highest level" of the Russian state, the Home Secretary has said.
Ben Wallace, the UK's security minister, said that Mr Putin and his government directed, controlled and funded the GRU. And the GRU is without doubt not rogue.
On Wednesday, the Prime Minister announced that charges would be brought against two men thought to be responsible for the poisoning of Sergei and Yulia Skripal. "It is led, linked to both the senior members of the Russian general staff and the defence minister, and through that into the Kremlin and the president's office".
The names "do not mean anything to us", they said, according to the Russian RIA news agency. "They [the investigators] are sure they [the suspects] are Russian".
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The Crown Prosecution Service said the pair were also wanted for the attempted murder of a first-responder policeman, Nick Bailey, who was also badly injured by the nerve agent, which was sprayed from the perfume bottle onto the front door of Sergei Skripal's house in Salisbury.