Russian nationals, Alexander Petrov and Ruslan Boshirov, have today been charged with the nerve agent attack on the former spy and his daughter according to the Crown Prosecution Service (CPS). "Now we have identified the individuals involved we can go even further", she told parliament.
Later, Prime Minister Theresa May said the men were officers in Russia's military intelligence service, the GRU, acting on orders from senior Kremlin figures, accusations Moscow has rejected as unacceptable.
The Russian ambassador to the UN, Vasily Nebenzya, once again denied the allegations on September 6, telling the Security Council that he heard "nothing new" from the British representative and that the charges against Moscow were an "unfounded and mendacious cocktail of facts".
British authorities identified the suspects as Russian nationals traveling on genuine passports under the aliases Alexander Petrov and Ruslan Boshirov.
After the attack, allies in Europe and the United States sided with Britain's view of the attack and ordered the biggest expulsion of Russian diplomats since the height of the Cold War.
The US ambassador to London, Woody Johnson, tweeted: "The US and United Kingdom stand firmly together in holding Russian Federation accountable for its act of aggression on United Kingdom soil".
Britain plans to press its case against Russian Federation in the U.N. Security Council Thursday.
Russian Federation has nothing to do with the Skripal poisoning case at any level, Kremlin spokesman Dmitry Peskov has said, slamming "unacceptable" British allegations.
"Every Russian intelligence service makes uses of freelance agents in its operations, including those carried out overseas", said Mark Galeotti, an expert on Russia's intelligence and security agencies.
The Foreign Office summoned Russia's charge d'affaires in London to demand Petrov and Boshirov come to Britain to stand trial, a spokeswoman said.
In 2007, Russia refused to extradite Andrei Lugovoi, the prime suspect in the murder by radioactive poisoning of former Russian agent Alexander Litvinenko in London.
"We now have sufficient evidence to bring charges in relation to the attack on Sergei and Yulia Skripal in Salisbury and domestic and European arrest warrants have been issued for the two suspects".
Nebenzia has argued if the British are saying Petrov and Boshirov brought Novichok into the country in this Nina Ricci bottle then there is a key inconsistency.
Basu added that photos of the men were being made public in the hope that a member of the public will recognise them. She also said "novichok" which was a military grade nerve agent was planted by the two who were officers in the GRU, Russian military intelligence.
Police believe this was a reconnaissance trip.
British authorities and the worldwide 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 suspects flew back to Moscow later that evening.
"We also note the UK's analysis, independently verified by the Organisation for the Prohibition of Chemical Weapons (OPCW), that the exact same chemical nerve agent was used in the poisoning of Dawn Sturgess and Charles Rowley as was used in the poisoning of the Skripals".
The Skripals recovered, as did a British policeman who fell ill after working on the case.
While the Skripals were critically injured but ultimately survived the attack, two Salisbury locals who found the perfume bottle in June, Dawn Sturgess and Charlie Rowley, were also badly injured.
Police said they were still not absolutely certain that the bottle found by Rowley was the bottle used to apply Novichok to Sergei Skripal's front door.