Russian hostages 'killed in Iraq'

Insurgents in Iraq say they have killed four Russian embassy workers kidnapped at the start of June.
The Mujahideen Shura Council, an umbrella group incorporating al-Qaeda in Iraq, released an internet video and a statement announcing their deaths.
The video showed one man being beheaded and another shot dead, as well as the body of a third, but there was no sign of the fourth hostage.
What dose it take to stop this sort of thing war doesn’t seem the be the answer. For every paramilitary killed seems to be replaced tenfold.
If you were in power what would do or what way would you handle it to bring all this terror to an end.