The U.N. General Assembly overwhelmingly approved the first international treaty regulating the multi-billion dollar global arms trade Tuesday.
Iran, North Korea and Syria voted "no" on Tuesday, while Russia and China, both major arms exporters, abstained.
Suzette Grillot is the co-author of the 2009 book The International Arms Trade. She says Syria opposed the treaty because it does nothing to prevent weapons from flowing to non-state actors, like the Syrian opposition.