Other countries and the Syrian rebels are awaiting specifics about new US aid, but President Obama is still weighing what steps to take and how far to go, reflecting continuing deep divisions across the administration.
Obama and Russia's Vladimir Putin, meeting at the G8 summit, both said they want a negotiated end to the Syria conflict. But that barely masked deep divisions over how best to pressure Syrian President Assad to talk rather than fight.
Iran's new president Hassan Rohani is considered a reform-minded moderate. But ruling clerics and the Revolutionary Guard remain in control of Iran's nuclear program and foreign affairs – including its close relationship with the regime of Bashar al-Assad in Syria.