While the future use of chemical weapons or incendiary bombs and/or white phosphorus for that matter, would surely warrant further escalation in the eyes of the administration whether such attacks were legitimate or "false flagged" - these are effectively banned ordinances - the fact that the White House considers barrell bombs a catalyst for escalation is surprising. The reason for that is that barrell bombs, or oil drums or cylinders packed with explosives and shrapnel, are among the most common form of weapons used by both sides in the Syrian civil/proxy war.
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