The same like in Libya, for example, and there was more than enough opportunity during 2012.
Perhaps even less: with enough money, weapons and supplies on hand, the insurgents could've finished the Assadist regime already by late 2012 - in turn preventing the spread of the ISIS. And even later on: as of early 2013 they were still advancing and by April last year the regime was really within weeks of collapse. Instead, the West did nothing, offering the regime - i.e. the IRGC - more than enough time to organize (Iranian) intervention.
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