Brett McGurk is a CNN global affairs analyst who served in senior national security positions under Presidents George W. Bush, Barack Obama, Donald Trump and Joe Biden. CNN  —  Following American airstrikes against Iranian nuclear facilities last week, and then the imposition of a ceasefire , it’s time to step back and assess what has changed in the Middle East, and the chances of translating military success into lasting strategic gains. In a national security crisis, what does not happen can

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