Russian Foreign Minister Sergei Lavrov has denied speculation that President Vladimir Putin is ill.
In an interview with French TV, Mr Lavrov said the Russian leader appears in public every day, and no sane person would see any signs of an ailment.
There has been increasing unconfirmed media speculation that Mr Putin, who turns 70 this year, may be suffering from ill health, possibly cancer.
The interview came as Russia continues its advance in Ukraine's Donbas region.
Mr Lavrov said the "liberation" of the eastern region was an "unconditional priority" for Russia.
He repeated the Kremlin's widely discredited line that Russia is fighting a "neo-Nazi regime".
Noting that President Putin regularly appeared in public, Mr Lavrov told TF1: "I don't think that sane people can see in this person signs of some kind of illness or ailment."
"You can watch him on screens, read and listen to his speeches," he said in comments released by the Russian foreign ministry.
"I leave it to the conscience of those who spread such rumours despite daily opportunities to assess how anyone is looking."
British intelligence sources were quoted telling media outlets that Mr Putin was seriously ill in the last week. However, rumours about the condition of the Russian leader, long known for his healthy lifestyle and love of sport, have surfaced periodically for years.
