Updated at 6:50 a.m. ET

Russian opposition leader Alexei Navalny has been discharged from a Berlin hospital after spending more than a month there following his poisoning in Siberia.

In a statement, Berlin's Charité Hospital said Navalny's condition had improved sufficiently for him to be discharged from inpatient care on Tuesday.

"Based on the patient's progress and current condition, the treating physicians believe that complete recovery is possible," said the statement. "However it remains too early to gauge the potential long-term effects of his severe poisoning."

"The decision to make details of Mr. Navalny's condition public was made in consultation with the patient and his wife," the statement added.

Navalny fell violently ill on Aug. 20 while on a plane traveling from the Siberian city of Tomsk to Moscow. The plane made an emergency landing in the city of Omsk, where Navalny was hospitalized in critical condition.

After days of political wrangling, a German non-profit organization gained permission from Russian authorities to fly Navalny to Berlin for treatment. As Navalny spent more than three weeks in a medically induced coma, a German military lab discovered traces of the Soviet-era nerve agent Novichok in biomedical samples from Navalny's body.

The findings, which were later confirmed by scientists in Sweden and France, spurred German Chancellor Angela Merkel to demand that Russia explain how Navalny came to be poisoned. Russia's government has denied any role in Navalny's poisoning.

Colleagues of Navalny say they found traces of Novichok on a water bottle in his Tomsk hotel room. The nerve agent was also used to poison Russian defector Sergei Skripal and his daughter in Great Britain in 2018. Russia denied any role in that attack as well.

Navalny's poisoning has led politicians throughout Europe to call for sanctions on Russia. In Germany, politicians from Merkel's own party have called on her to halt construction on the controversial Nord Stream 2 pipeline that aims to carry Russian natural gas to Germany. Merkel has refused to delay the project.

After doctors removed Navalny from his coma more than a week ago, he has taken to Instagram to say he does not intend to stay in Germany. Rather, Navalny has vowed to return to Russia to continue his work of investigating corruption among the country's elite and pressing for democratic reform.

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