An estimated 40,000 people took to the streets of Moscow on Saturday, with rallies held across almost 40 cities and towns.
Trump described the situation as "tragic", adding that while he hadn't seen "any proof" of poisoning he would investigate.
Novichok, a Soviet-era nerve agent, was used to poison former Russian spy Sergei Skripal and his daughter in Britain.
“We assume that Alexei was poisoned with something mixed with his tea. That’s the only thing he drank this morning.”
Navalny’s physician has claimed he may have been harmed by 'undefined chemical substances'.
The demonstration in the centre of the city lasted more than seven hours on Saturday.
Russian police have detained opposition leader Alexei Navalny and over 1000 protestors at a demonstration against President
Russia's 2018 presidential elections are now less than six months away. The Kremlin is almost conspicuously silent about
A few weeks ago Alexei Navalny walked out of court in Russia and straight into a protest against Putin, to many people's surprise. The surprise was not that he arrived at the protest and was subsequently rearrested but that he was released at all...
The Russian punk-protest band, Pussy Riot, released a new video late Monday night calling for a mass demonstration in Moscow in response to the trial of a prominent opposition activist. It's the band's first video in almost a year.