The CIA provided information that helped prevent bombings in St Petersburg's Kazansky Cathedral and other sites, the Kremlin said.
Konstantin Kozlovsky said he began cooperating with the FSB back in 2008 at the age of 16 and "did everything that they said".
Despite outspending both Russia and China on national security, the US military could lose the next war - new Rand Corporation report claims.
"I have taken a decision: a significant part of the Russian troop contingent located in Syria is returning home to Russia," Putin said.
He will stand in elections which will be taking place next year in Russia and victory would see him lead until 2024.
The Kremlin has been drawn into a war of words with the UK press over whether a President Vladimir Putin calendar has sold out in Britain.
Dmitry Medvedev, the PM of Russia, today (30 November) said that state-sponsored hacking and espionage is normal, criticising the belief that every hack has Kremlin links.
Russian footballer Alexei Smertin says rainbow flags will be tolerated at World Cup despite gay propaganda law that bans promotion of homosexuality to under-18s.
Subjects at the General Yermolov Cadet School in southern Russia include handling firearms, disarming landmines, forest survival training and learning Morse code.
Weather satellite fails to enter orbit in further blow to Russian space programme.
Chechnya's leader Ramzan Kadyrov accused of arresting and torturing gay men in Russian republic says he is "ready to resign" as Vladimir Putin plans running for fourth term.
Russian president signs law requiring foreign media outlets to register as "foreign agents" putting them under additional scrutiny.
Russian President Vladimir Putin stars in a series of 2018 calendars showing him fishing while topless, holding cute animals, and straddling a motorbike.
Russian President Vladimir Putin spoke at a meeting of military leaders in Sochi saying that 'all large-scale enterprises' should be ready to meet war-time production levels.
Vitaly Bespalov said IRA employees working in the "American department" were paid about $1,300 to $2000 per month to create inflammatory content.
Whereas once the West was responsible for everything good in the world, today it is the source of everything that is bad.
National Cyber Security Centre chief Ciaran Martin will confirm that Moscow hacked the UK's energy grid to try to cause a blackout in Britain.
However, President Trump still refuses to say whether he believes the denials from the Russian leader.
"Find you a man who looks at you the way Donald Trump looks at Vladimir Putin," one Twitter user wrote.
Trump and Putin greeted each other with a firm handshake as they attended the Asia-Pacific Economic Cooperation summit in Vietnam on 10 November.