Kremlin critic Alexei Navalny says he will fly back to Russia on January 17 from Germany, where he has been convalescing after being poisoned.
Mr Navalny, one of President Vladimir Putin’s leading critics, was airlifted to Germany for treatment in August after collapsing on a plane in what Germany and other Western nations say was an attempt to murder him with a Novichok nerve agent.
Russian authorities deny any involvement in the incident.
“It was never a question of whether to return or not. Simply because I never left,” Mr Navalny wrote on Instagram.
“I ended up in Germany after arriving in an intensive care box for one reason: They tried to kill me.
“[President Vladimir Putin’s] servants are acting as usual by fabricating new criminal cases against me. But I’m not interested in what they’re going to do to me. Russia is my country, Moscow is my city and I miss it.”
Mr Navalny said he had probably almost fully recovered his health.
The Siberian hospital that first treated him said he had been diagnosed with a metabolic disease caused by low blood sugar.
He was flown to Berlin for treatment two days after he fell ill, after his transfer was initially denied by the Siberian hospital, which said moving him could be dangerous.
In September, French and Swedish labs confirmed German findings he had been poisoned with Novichok.
Mr Navalny’s announcement came a day after court documents showed Russian authorities had asked a court to jail him for allegedly breaking the terms of a suspended sentence for what he says was a politically motivated conviction.
Russia’s Federal Prison Service (FSIN) last month ordered Mr Navalny to immediately fly back and report at a Moscow office or be jailed if he failed to return in time.
Mr Navalny and his allies have accused Russian authorities of trying to scare him off returning ahead of parliamentary elections due to be held in September.
Russia has said it has seen no evidence he was poisoned and has denied trying to harm him.
The Kremlin has said Mr Navalny is free to return to Russia at any time like any other Russian citizen.