A Moscow court has issued an arrest warrant for Yulia Navalnaya, widow of the late opposition leader Alexei Navalny, accusing her of participating in an 'extremist organization.' Navalny, a fierce critic of President Vladimir Putin, died in February in an Arctic prison while serving a politically motivated 19-year sentence. Russian authorities have denied involvement in Navalny's poisoning and death. Navalnaya, who resides abroad, has vowed to continue her husband's work and has called for mass protests against Putin. Her arrest in absentia marks the latest move in a sweeping Kremlin crackdown on the opposition.