This should be designated as an act of war. NO MERCY to the perpetrators, or their relatives. This is one of the few things the Rooskis do right.
Same goes for 9/11. Bush should have gone before Congress and asked for a Declaration of War, just as FDR did right after Pearl Harbor.
And no, Congressional resolutions and authorizations are not the same. They don't carry the same force, and they don't send the same message.