I doubt that any US strike will target known locations for Russian personnel. I doubt the Russians would shoot at our missiles, though they would probably coach/let the Syrians do so (as did that group of separatists in Ukraine who waxed those poor Dutch). Plausible deniability etc.
Putin wants the USA as a vague threat/obstacle to keep up the Russian 'need' for his strong leadership. I do not think he wants an actual firefight. Cui bono?
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