Artyom Platov, spokesman for OVD-Info, a group that monitors politically motivated arrests, said at least 66 had been arrested in Russia's second city and Putin's hometown.
Saudi King Salman bin Abdulaziz al-Saud pays first ever state visit to Moscow
Energy demand will shift to Asia-Pacific region amid development of new markets over next decade
Turkish, Russian presidents speak ahead of Thursday meeting in capital Ankara
The two leaders will meet in the Black Sea resort city of Sochi to "discuss the latest developments in the region," Netanyahu's office said in a statement.
US diplomats to leave country after Washington's sanctions against Moscow, Russian president says
Some 50 warships and submarines were on show along the Neva River and in the Gulf of Finland off the country's second city of Saint Petersburg after Putin ordered the navy to hold its first ever parade on such a grand scale.
Kremlin spokesman says there was no undisclosed second meeting between Russian, American heads in Hamburg
The jet was downed in conflict-torn eastern Ukraine on July 17, 2014, killing all 298 people on board, including 38 Australian citizens and residents.
Russian president says US view of Syrian conflict is becoming 'more pragmatic'
The popular tabloid Komsomolskaya Pravda headlined its front page "Putin and Trump found a way to peace in Syria and Ukraine" and devoted two pages to analysis of the leaders' public handshake.
The meeting in Moscow comes as North Korea claimed the launch of its first inter-continental ballistic missile, and US President Trump urged China to "end this nonsense once and for all".
Unclear whether Russia's meddling in US elections will be discussed
Speaking to students in Germany to commemorate the 70th anniversary of the Marshall Plan to rebuild a ravaged Europe after World War II, Mattis said Russia had chosen to challenge the "secure and peaceful" post-war order.
"Of course this will make Russia-US relations more complex," Putin said in an excerpt from an interview due to air in full at 1700 GMT on Rossiya-1 television.
New sanctions bill against Moscow is evidence of 'internal political struggle' in US, President Vladimir Putin says
Speaking at his annual call-in with Russian citizens, Putin, a former KGB officer, said he found Comey's behaviour strange for a security official, after Comey leaked details of his meetings with Trump.
The 41-year-old, whose anti-corruption videos have needled the country's most powerful and drawn a new generation into politics, is bidding to stand in elections against President Vladimir Putin next year.
In interviews with director Oliver Stone, Russian president outlines criticism of alliance
Russian president denies claims Moscow interfered in 2016 presidential poll, despite claims by US intelligence agencies
"Putin expresses his profound condolences for the British people and condemns the terrorist attack carried out hours ago in London," Kremlin spokesman Dmitry Peskov told Russian news agencies.