The Double

The mysterious murder of a US senator bearing the distinctive trademark of the legendary Soviet assassin "Cassius," forces Paul Shepherdson (Richard Gere), a retired CIA operative, to team with rookie FBI agent, Ben Geary (Topher Grace), to solve the crime. Having spent his career chasing Cassius, Shepherdson is convinced his nemesis is long dead, but is pushed to take on the case by his former supervisor, Tom Highland (Martin Sheen). Meanwhile, Agent Geary, who wrote his Master's thesis on Shepherdson's pursuit of the Soviet killer, is certain that Cassius has resurfaced. As Shepherdson and Geary work their way through crimes both past and present, they discover that Cassius may not be the person they always thought him to be, forcing both to re-examine everything and everyone around them.

the official version from youtube.com on August 31, 2011

After the mysterious murder of a senator which bears the marks of a Soviet assassin, who was long thought to be dead, a retired CIA operative, who spent his career going toe-to-toe with his Soviet nemesis, is teamed with a young FBI agent to track down the killer.

A young FBI agent teams up with a CIA agent to find a Russian hitman. The FBI agent discovers that the CIA agent is the hitman.