Ecuador has cut Julian Assange’s internet connection at its embassy in London, preventing him from communicating with the outside world.
The move is to prevent the WikiLeaks founder from interfering in other countries’ affairs, Ecuador said.
It comes after Mr Assange questioned accusations that Moscow was responsible for the poisoning of a Russian ex-spy and his daughter in the UK on 4 March.
Mr Assange was granted political asylum at the Ecuadorian embassy in 2012.
He was initially staying in London to avoid extradition to Sweden to face questioning over allegations of sex crimes, which the 46-year-old has always denied.
The Swedish authorities have since dropped their investigation, but Mr Assange believes he will be extradited to the US for questioning over the activities of WikiLeaks if he leaves the building.