MOSCOW (Reuters) – Russian President Vladimir Putin on Wednesday postponed his visit to Kazakhstan on Wednesday, where he was awaited to hold a summit on the Eurasian Customs Union. The move comes amid rumours of Putin’s ill health.

The meeting would be delayed indefinitely, according to Kazakh spokesman Dauren Abayev. An anonymous Kazakh government official told Reuters that “it looks like he [Putin] has fallen ill.”

Kremlin spokesman Dmitry Peskov told Interfax that President Vladimir Putin is in good health, but could not say when his next public appearance would be. “He has meetings all the time”, Peskov said. “He has meetings today, tomorrow. I don’t know which ones we will make public.”

Russkiy Monitor republished an email it allegedly received claiming that Putin has had a stroke. “A letter arrived in the electronic email box of Russkiy Monitor signed by an anonymous official of the Central Clinical Hospital of the Department of Presidential Affairs in Moscow, in which he reported that among the patients of this elite Moscow hospital, where the top leadership of the Russian Federation are registered, there were rumours that Vladimir Putin was diagnosed several days ago with an ischemic stroke”, it read.

Russkiy Monitor also published an anonymous online post from a user claiming that the Russian embassy in London was set to make a major announcement shortly.

Medical experts have speculated that Putin may have suffered a stroke previously, possibly in utero, based on analysis of footage of his movement and speech.