The Russian opposition leader plans to return to Russia, according to his spokesperson. "It's puzzling to me why anyone should think otherwise," the spokesperson said.
The move, which comes months after the attack in the U.K. on Russian ex-spy Sergei Skripal and his daughter, follows pressure on the Trump administration from lawmakers in both parties.
The nerve agent that recently killed a woman and left a man hospitalized was discovered in a "small bottle." It is unclear where it came from and how it got into the man's house in Amesbury, England.
Charlie Rowley awoke from a 10-day coma and had a brief conversation with investigators working around the clock to find the source of the deadly nerve agent.
Police in Britain say two people have been exposed to Novichok, the same nerve agent that poisoned former Russian spy Sergei Skripal and his daughter Yulia in March.
British police say a couple who were found gravely ill on Saturday had been poisoned with the same nerve agent that was used in an attack earlier this year on a former Russian spy and his daughter.
Doctors and nurses took steps quickly that saved the lives of Sergei Skripal, 66, and his 33-year-old daughter, Yulia after they were attacked with a deadly nerve agent on March 4.
In her first appearance on camera since the March poisoning, Skripal said that she was concentrating on nursing her father back to health, but that she eventually hoped to return to Russia.
Hospital officials say Skripal, 66, will continue his recovery elsewhere. He was found slumped over on a bench on March 4 along with his 33-year-old daughter, Yulia Skripal.