After U.S. intelligence agencies released evidence showing that Assad’s army had fired canisters of sarin gas into residential neighborhoods on August 21, Obama signaled his intention to punish Assad for crossing America’s one clear “red line.” Yet, despite widespread outrage over the deaths, the White House could not muster the political support for a military strike. Congress blocked a vote on a resolution authorizing air strikes against Assad, and the Parliament in Britain—a country presumed to be a key ally in any military campaign—rejected a similar proposal by Prime Minister David
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