Alexei Navalny's wife and a top aide have visited him in a Berlin hospital where the comatose Russian dissident is being treated by German doctors after a suspected poisoning.
Mr Navalny was flown to Germany on Saturday from Siberia after doctors determined he was stable enough to be brought to the capital's Charite hospital for treatment.
After his arrival, hospital spokeswoman Manuela Zingl said the 44-year-old would be undergoing extensive diagnostic tests and that doctors would not comment on his illness or treatment until they were able to evaluate the results.
On Sunday, Mr Navalny's wife Yulia Navalnaya and aide Leonid Volkov visited the Russian opposition leader in the hospital, making no comments to reporters.
Mr Navalny, a politician and corruption investigator who is one of Russian President Vladimir Putin's fiercest critics, was admitted to an intensive care unit in the Siberian city of Omsk on Thursday.
His supporters believe that tea he drank was laced with poison - and that the Kremlin is behind both his illness and a delay in transferring him to Germany.
Mr Navalny fell ill on a flight back to Moscow from Siberia on Thursday and was taken to hospital after the plane made an emergency landing.
While his supporters and family members insist that Mr Navalny was poisoned, doctors in Omsk have denied that, theorising a metabolic disorder was the most likely diagnosis and that a drop in blood sugar may have caused Mr Navalny to lose consciousness.
Russian health authorities on Saturday said that tests done so far have not shown any poisons in his system.
When German specialists arrived aboard a plane equipped with advanced medical equipment on Friday morning at his family's behest, Mr Navalny's physicians in Omsk initially said he was too unstable to move.
The dissident's supporters suggested that was just a ploy to delay his departure until the poison was out of his system.
The Kremlin denied that resistance to the transfer was political, with spokesman Dmitry Peskov saying that it was purely a medical decision. However, the reversal to allow him to leave came as international pressure on Russia's leadership mounted.
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