Russian opposition leader Alexei Navalny was "poisoned" by an unidentified toxic substance but doctors have sent him back to jail despite his condition, his lawyer and personal physician said Monday.
President Vladimir Putin's top opponent was rushed to hospital on Sunday a day after almost 1,400 people were arrested at an unauthorised protest, in the largest
police crackdown on dissent in recent years.
Navalny was hospitalised following what was described as an acute allergic reaction, but his supporters later said they believed he had been exposed to poison.