Chemical weapon destruction is starting at the last of nine sites that once held the massive U.S. arsenal.
Russia Challenges Changes to CWC
A number of international bodies have been engaged in investigating alleged chemical weapons use in Syria, although attribution and accountability gaps remain to be filled.
OPCW Says Chlorine Used in Syria Attack
Nerve agent attacks have led Chemical Weapons Convention parties to update the treaty's list ofmost dangerous chemicals.
Tensions are evident over international efforts to investigate chemical weapons use in Syria.
Russian Chemical Weapons Use Draws More Sanctions