The incident happened in March when former Russian double agent Sergei Skripal and his daughter were poisoned with a nerve agent in Salisbury, leaving them in critical condition and setting off a diplomatic crisis.
She said that the GRU is a highly disciplined organisation with a well-established chain of command and that Petrov's and Boshirov's mission was likely approved at a senior level of the Russian state.
May told parliament on Wednesday the Crown Prosecution Service was ready to charge two Russian citizens - Alexander Petrov and Ruslan Boshirov - with an attempt on the lives of Sergei Skripal and his daughter Yulia.
Over the course of two days, the men traveled from London to Salisbury, England, twice - once to perform reconnaissance around the Skripals' home, and again to put lethal poison on their front door, police say.
The investigation by the CPS recovered CCTV footage of the two Russian nationals after they flew into Gatwick airport on an Aeroflot flight on the 2 March and stayed in the City Stay hotel in east London.
"We have, however, obtained a European arrest warrant (EAW)", said CPS director of legal services, Sue Hemming. The British government accused Russian Federation of carrying out the attack with the nerve agent Novichok, but Moscow has strongly denied any involvement. Bailey was sickened after attending to the Skripals where they were found in Salisbury. Officials determined that the same substance, found in a perfume bottle in a park weeks later, sickened a man and his girlfriend, who later died.
They are also charged with illegal use and possession of a chemical weapon. They stayed in a hotel in London - where traces of Novichok were also found - and made two trips to Salisbury.
Police released images of a counterfeit Nina Ricci Premier Jour pink perfume box and a bottle with a modified nozzle that was used to secrete the military-grade nerve agent into Britain.
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That confirms a statement made by Charlie Rowley, who said that in July he had found what he thought was a bottle of perfume, which he had given to his partner Dawn Sturgess who later died from the effects of Novichok.
May says it is "highly likely Russian Federation was responsible". Police said Novichok was applied to the front door of the Skripal's home.
"Australia shares the UK's anger and outrage at this unsafe and deliberate act by Russian Federation, which also puts at risk the British public, police and other first responders", Mr Morrison said in a statement on Thursday.
Basu said the British pair were not targeted but fell ill "as a result of the recklessness in which such a toxic nerve agent was disposed of".
Police are still trying to determine where the bottle was between the Skripal poisoning in March and its discovery by Rowley on June 27.
But assistant commissioner Neil Basu, head of counterterrorism at London's Metropolitan Police, conceded it was "very, very unlikely" police would be in a position to arrest them any time soon. It contained Novichok. Basu said police had no doubt the events were linked, and were discussing charges over the Sturgess and Rowley case with prosecutors.
Britain charged two Russians with the murder of Litvinenko but both remain in Russia.
"We said right away that Russia had nothing to do with the Salisbury incident", Aleksandr Shulgin told Russian state media.