All the dangerous substances from Syria's chemical weapons program, including sulfur mustard and precursors of sarin, have now been removed from the country after a monthslong process, a Hague-based watchdog agency said Monday.

The announcement marks a diplomatic and logistical milestone. Never before has a country's entire chemical arsenal been removed from its borders, and now the most lethal chemicals are set to be destroyed aboard a U.S. ship at sea.

...