Syria's government warned the U.N. Security Council that delivering humanitarian aid across its borders into rebel-held areas without its consent would amount to an attack, suggesting it would have the right to retaliate against convoys.
A rebel's child who isn't starving is as dangerous to Assad as a car bomb going off next to his motorcade. Naturally his consent will involve allowing aid only to areas Assad approves in order to reward friends and punish enemies.
Hillary Clinton, when she was Secretary of State, explained our unwillingness to arm rebels early in the rebellion on the notion that we didn't want to "militarize" the conflict.
Only 160,000 dead later, UN aid is being militarized by Assad--if we let him.