THE HAGUE, Netherlands (AP) — In just over a month, Syria is supposed to have rid itself entirely of its chemical weapons program and the 1,300-metric ton stockpile of mustard gas and precursor chemicals it declared to the global watchdog overseeing the destruction. But the June 30 deadline, agreed upon last year, now appears out of reach.

Here’s what’s been done so far in the unprecedented mission — the first time the Organization for the Prohibition of Chemical Weapons has attempted to oversee the dismantling of a country’s chemical weapons program in the midst of a war — and what remains to be accomplished.