Britain has written to the Organization for the Prohibition of Chemical Weapons (OPCW) to arrange external verification of a military-grade nerve toxin used to attack a Russian double agent, Prime Minister Theresa May's spokesman said on Friday.
After the first known offensive use of such a weapon in Europe since World War II, May blamed Moscow and gave 23 Russians who she said were spies working under diplomatic cover at the London embassy a week to leave.
"The United States believes that Russia is responsible for the attack on two people in the United Kingdom using a military-grade nerve agent", Haley said in her remarks at a UN Security Council emergency session, blasting the Russian government for flouting worldwide law.
"Russia's response doesn't change the facts of the matter - the attempted assassination of two people on British soil, for which there is no alternative conclusion other than that the Russian State was culpable".
Britain, the United States, Germany, France and New Zealand have called on Russian Federation to explain the attack.
London is mooting possible punishment against Moscow, with British communications regulator Ofcom saying it could review the licence of the Kremlin-backed RT broadcaster if Russian involvement in the poisoning was proven.
The last moments before the aircraft crash in Nepal
Canadian plane maker Bombardier said it was sending an air safety investigator and a field service representative to the site. The latter responds and says "We would like to land on 20"; he is cleared to land on that end of the runway, the report said.
The four leaders described an "assault on United Kingdom sovereignty", a "clear violation" of the global prohibition of chemical weapons and a "breach of worldwide law". The Russian reaction would be made in line with its national interests, he said, and will be announced "very soon".
Amid a threat of Russian retaliation to Britain's action against Moscow, Russian President Vladimir Putin chaired a meeting of his security council on the poisoning of Mr Skripal and his daughter.
Relations strained further on Friday when London's Metropolitan Police said that it's treating as murder the death of Nikolai Glushkov, a close associate of Putin opponent Boris Berezovsky-a one-time billionaire who was himself found hanged in 2013 in his house outside London. British police said they were treating Glushkov's death as unexplained, but did not think it was linked to the attack on the Skripals.
The attack on former Russian spy Sergei Skripal and his daughter Yulia in Salisbury was highlighted by the US Treasury as one of the justifications for the tougher line against Moscow.
Meanwhile the Kremlin continued to consider how to respond to Mrs May after the largest expulsion of diplomats since the Cold War was announced on Wednesday.
Britain said it was not enough though, and in 2016, a judge-led inquiry concluded that Putin had probably approved Litvinenko's murder, something Moscow denies. It has been a target for Russian authorities since most of its operations were closed by authorities in many Russian regions 10 years ago.
Russian court officials at the time said he'd received at least $100,000 for his work for MI6, the British intelligence service.