[It] seems unlikely that, if the Russians help facilitate a post-Assad transition, Washington would take a hands-off position going forward. Both Russia and the U.S. will then be vying to shape the politics of post-Assad Syria with nothing but their own interests in mind (and to the detriment of the Syrian people, if history guides). To Moscow and Washington, what happens in Syria is about them, not about the well-being of Syrians. If an obsessive-compulsive commitment to insidious intervention in the internal affairs of others remains the status quo, such a deal will be increasingly remote.
The Politics of Intervention Prevent Resolution in Syria