But Syria could certainly cut off the flow of re-supply to Hezbollah, which eventually would be felt, and Hezbollah could not ignore that if Syria took that step.

NPR: Defining Syria's Role in Mideast Peace

Secretary of State John Kerry, on a surprise one-day visit to Baghdad, pressed Iraqi officials Sunday to cut off the flow of Iranian arms to the Syrian government and warned that future American aid to Iraq could be at risk if it doesn't.

WSJ: U.S. Prods Iraq to Stop Arms Going to Syria