Syria has agreed to surrender its chemical weapons - but how can they all be found and disposed of?
Russia inherited a massive chemical weapons stockpile from the Soviet Union at the end of the Cold War. Its decision to put an end to that deadly legacy has been met with praise.
The chemical weapons watchdog OPCW said sarin was used in an attack on a northern Syrian town five days before the banned nerve agent killed dozens in Khan Sheikhoun, prompting global outrage.
Syrian forces used chemical weapons at least 27 times over the course of the civil war, UN investigators have found. The UN report also decries the US for failing to protect civilians in its attacks on Islamist forces.
The Syrian government has said Israel targeted a military facility in Masyaf, killing at least two people. The target is believed to have been a Syrian government agency branch responsible for producing chemical weapons.
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