Stability First, Containment Later
1) Engage Iran and Syria in stabilizing Baghdad, and if that works,
2) Redeploy US troops to permanent bases in Iraq, from which the US could strike the guerrillas and the militias.
Maybe it's me, but I see the story of a failure foretold. If you are Iran, are you going to help the US stabilize Baghdad so it can then fortify permanent military bases directing a threat at you? One thing is certain, neither country is likely to play ball without big concessions. I really don't believe that Washington will offer the right things, like WTO membership, dropping of economic sanctions, guarantees of sovereignty, financial assistance and so forth. Maybe Washington should be thinking of something more realistic, like getting the Georgians out of hot water with the Russians.