Filmed Above Moscow, March 3 2011.

The video begins with two bright objects in the sky. One is moving (the helicopter), and the other appears stationary (UFO). At one point, the helicopter seems to pass directly in front of the UFO. The bright object that was stationary then moves to the right of the screen and off camera.
[video]3sVYkby9OXQ[/video]

Video - Incredible UFO Buzzed By Helicopter 2011 - National unexplained phenomena | Examiner.com