A potentially dangerous military escalation is underway above Syria after U.S.-backed forces shot down a Syrian fighter jet.
Russia, Syria's closest ally, is now vowing to treat all U.S. planes in that part of Syrian airspace as targets.
Syria has been testing the U.S. with a series of provocative moves, escalating an already tense relationship between the U.S. and Russia, despite the shared goal of defeating ISIS.
Read more: http://nbcnews.to/2tGDfEm
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