After more than two months, 66-year old former Russian spy Sergei Skripal has been discharged from the hospital after being poisoned by a military-grade nerve agent, British authorities said Friday.
"It is fantastic news that Sergei Skripal is well enough to leave Salisbury District Hospital", the hospital's Chief Executive Cara Charles-Barks said in a statement.
Nursing director Lorna Wilkinson said treating him and two others poisoned by the same nerve agent had been "a huge and unprecedented challenge". She and her government say that in addition to forensic evidence, Russian Federation is suspect because it has assassinated critics overseas before.
The 66-year-old was found slumped on a park bench in the city on 4 March, with his daughter Yulia. They have been taken to an undisclosed location for their safety. But their health began to improve rapidly, and Yulia was discharged last month.
"However, treating people who are so acutely unwell, having been poisoned by nerve agents, requires stabilising them, keeping them alive until their bodies could produce more enzymes to replace those that had been poisoned", it added.
Russia has staunchly denied the allegations, which also led to other Western countries joining the United Kingdom in expelling Russian diplomats from their countries.
The poisoning incident had triggered a major diplomatic crisis after the British government accused the Kremlin of organising the attack Skirpal and his daughter with a Soviet-era deadly nerve agent called Novichok.
In late March, police identified the highest concentration of the nerve agent on the home's front door.
The Russian embassy declined to comment on Skripal's release from hospital but Russia's ambassador to London, Alexander Yakovenko, was due to give a news conference later on Friday.
"This is a complex investigation and detectives continue to gather and piece together all the evidence to establish the full facts and circumstances behind this terrible attack".
Both she and her father are now likely to be in protective custody.
The Metropolitan Police said its investigation into the attack continued and it would not "be discussing any protective or security arrangements that are in place".
In response to the March attack, British Prime Minister Theresa May had condemned the poisoning as a reckless and hostile act by Russian Federation on British soil.
He moved to Britain as part of a spy swap in 2010 and has lived there ever since.