The opening scene is set in the Balkans where two American (?) snipers are staking out a bombed-out building where hostages are being held. A third guy shows up, kills the snipers, the hostage-takers, and the hostages then blows up the building.
The action then fast-forwards to a few years later in the US. The villain (same guy as above) sets up his rifle on top of a building and shoots a politician/government official as he exits an airplane.
One of the politician's security detail joins a female investigator (not sure which agency) on the case.
The villain later makes another attempt at the politician's wife from the woods outside her home. This time he brings a patsy along.
I saw this in a crowded bus so I may have gotten some details a bit wrong, not to mention the bus reached my stop in the middle of the movie.
If it helps, the villain was the only African-American (?) in the cast.
Edit: The security detail guy seemed like he was a former sniper. Not sure, he might even have been one of the guys "killed" in the opening scene. Tried Googling and checking IMDB. No luck, or maybe my search skills are bad.