I think we just cannot stop applying pressure insisting on Syria's compliance with international humanitarian standards and human rights law.
As I said, Syria is always very insistent about its sovereignty, but under established practice of international humanitarian law, it has the obligation to facilitate or not impede access. It has allowed cross-border convoys from both Jordan and Iraq when those convoys have been taking supplies to government-controlled areas.
What we want to push for is have our bases reach people on the basis of need, not on the basis of location. This message needs to be passed unceasingly not only to Syria but to those who support Syria, Russia and Iran, and in fact all parties to the conflict and all sides.
We do have problems with opposition groups, and of course we have particular difficulties with the ISIS, but given the preponderance of force, the Syrian regime is the greatest challenge.