Secretary of State Antony Blinken said Saturday the United States was "deeply troubled" by Russia's growing intolerance of free speech, on the sixth anniversary of opposition politician Boris Nemtsov's murder.

US State Secretary Blinken says US 'deeply troubled' by Russia's intolerance of free speech

Russia on Saturday marked the sixth anniversary of assassination of opposition politician Boris Nemtsov -- one of President Vladimir Putin's loudest critics until he was shot and killed on a Moscow bridge near the Kremlin on February 27, 2015.

Russia marks sixth anniversary of Kremlin critic Nemtsov's assassination

Thousands rallied in central Moscow on Saturday to call on President Vladimir Putin not to stay in power indefinitely, in the first major protest by the Russian opposition since the Kremlin chief announced controversial plans to change the constitution.

Opposition urges 'Russia without Putin' in rally for slain liberal

Charismatic Boris Nemtsov was gunned down two years back and some 15,000 protesters demanded further probe into his assassination

Russians throng central Moscow to remember Putin-critic Nemtsov's murder

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US State Secretary Blinken says US 'deeply troubled' by Russia's intolerance of free speech

Russia marks sixth anniversary of Kremlin critic Nemtsov's assassination

Opposition urges 'Russia without Putin' in rally for slain liberal

Russians throng central Moscow to remember Putin-critic Nemtsov's murder