British officials faced their Russian counterparts at the UN Security Council's special meeting to discuss the Salisbury novichok attack.
The meeting was called by the UK after Theresa May said the two men charged with carrying out the assassination attempt were Russian spies.
While the prime minister said the attack was approved at “a senior level of the Russian state", senior Conservatives directly accused the Russian president, Vladimir Putin, of approving the operation.
Speaking in the Commons, Ms May told MPs the attack was carried out by two Russian spies and sanctioned at a “senior level” by Vladimir Putin’s regime.
She said investigations had concluded that the two suspects were members of the GRU, Russia’s military intelligence service, and it was not a “rogue operation”.
Ms May told MPs the UK would push for new sanctions against Russians responsible for cyber attacks, additional listings under the existing regime and promised to work with intelligence allies to “counter the threat posed by the GRU”.
The US, France, and Germany, and Canada have also agreed with the UK the Russian government "almost certainly" gave the green light on the novichok attack.
"We have full confidence in the British assessment that the two suspects were officers from the Russian military intelligence service, also known as the GRU, and that this operation was almost certainly approved at a senior government level," the joint statement read.
During the meeting UK Ambassador to the UN Karen Pierce and Russia's Permanent Representative to the world body Vasily Nebenzya traded diplomatic barbs, with US Ambassador to the UN Nikki Haley joining in with her characteristically bold language.
Ms Pierce said UK police have been conducting a "painstaking and forensic investigation," having gone "through 11,000 hours of CCTV footage" and conducted approximately 14,000 interviews to come to their conclusion about the suspects.
She indicated CCTV footage showed the two suspects in the vicinity of Mr Skripal's home in Salisbury around the time of the 4 March attack and it was determined the suspects, Alexander Petrov and Ruslan Boshirov, were part of Russian military intelligence, a unit called the GRU.
"The GRU has time and again" interfered in other countries' affairs, Ms Pierce said. She pointed to the hacking of the Democratic National Committee's emails during the 2016 US presidential election as one example.
"They played dice with the lives of the people of Salisbury," she noted.
"The UK has no quarrel with the Russian people, we continue to hold out hope we will have" strong relations with the government, Ms Pierce said.
Again, she used the words "brazen" and "reckless" to describe the suspected actions of the Russian suspects and the Kremlin. Several other countries joined in her sentiments.
Mr Nebenzya retorted, accusing Downing Street of "Russophobia" and claimed the accusation Moscow was not cooperating with London was false.
"It's still not clear why Russia would want to poison the Skripals...and do it in such a strange, sophisticated way," he said, repeatedly questioning various issues with the investigation's conclusions about the suspects, their nationality, and their supposed affiliation with GRU.
"It is actually amazing to see the...clarity" of the UK poilice investigation results, Ms Haley commented, adding the evidence could not be denied.
"Every one of us should be chilled to the bone" with the results of the investigation.
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Salisbury attack suspects are Russian security service officers, Theresa May tells MPs
Prime minister says wanted Russian men were spies - but declines to say that Vladimir Putin himself sent themShe told reporters in Brussels that March's European Council meeting after the initial attack had confirmed "that we stand with the UK in pursuit of justice in this case and remain ready to offer support".
He said: "Ultimately he does, insofar as he is president of the Russian Federation and it is his government that controls, funds and directs the military intelligence - that's the GRU - via his minister of defence."
Asked whether there would be retaliation for Russia's activities, particularly in cyber space, Mr Wallace said: "We do all the time, but we retaliate in our way.
He said Russia "has no reasons" to investigate Alexander Petrov and Ruslan Boshirov because Britain has not asked for legal assistance on the case.
"The GRU is a highly-disciplined organisation with a well-established chain of command. So this was not a rogue operation. It was almost certainly also approved outside the GRU at a senior level of the Russian state," Ms May claimed.

Timeline of movements by Russian 'spies' charged with attempted assassination of Sergei Skripal
Police appealing for information on suspects and their movements over two days in the UKThey also said: "Yesterday's announcement further strengthens our intent to continue to disrupt together the hostile activities of foreign intelligence networks on our territories, uphold the prohibition of chemical weapons, protect our citizens and defend ourselves from all forms of malign state activity directed against us and our societies."

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