Information provided by the CIA helped Russian security services foil an attack on St Petersburg's Kazan cathedral, the Kremlin says.

Police in Moscow detained more than 20 anti-corruption protesters who took to the streets on Sunday in a follow-up of last week's large-scale demonstrations in the Russian capital, according to a Reuters witness.

Flynn’s trip has drawn criticism from some former national security officials as a case of bad judgment, at a minimum, given RT’s key role in promoting Russian government interests and working against the U.S. U.S. intelligence officials had been raising red flags about the issue for years

Russia has criticised the US and UK for using "unacceptable" tone and rhetoric in speeches on Syria at the UN, after being accused of "barbarism".