Bashar Assad almost certainly crossed a 'red line' by using sarin or some other chemical weapon against his own people, President Obama said in April. The casualty toll from the latest suspected use suggests sarin henceforth will be associated with Syria and Mr. Assad.
Syrian opposition leaders and rebels have criticized what they see as US disengagement from a conflict that has claimed more than 100,000 lives. Kerry's news on promised US arms may do little to change that view.
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