From the state-run (KGB/FSB) propaganda outlet, RIA Novisti:
MOSCOW, August 9 (RIA Novosti) – Russia’s Northern Fleet’s anti-submarine forces have detected and forced out a US submarine from Russian boundary waters, a high-ranking source in Russia’s Navy told RIA Novosti Saturday.
“On August 7, 2014, the patrol forces of the Northern Fleet detected a foreign submarine, supposedly a US Navy Virginia-class one, in the Barents Sea. A seaborne anti-submarine group, as well as an anti-submarine airplane Il-38, was sent to the region to search and track it down,” the source said.
The Russian navy forced the submarine out of Russian waters after a 27-minute contact.
Full article: Russia Forces US Submarine Out of Boundary Waters (RIA Novosti)