AFAIK, Russia was informed by the US about the missile strike and they got their planes and people away from the airfield which was targeted. Russia uses this airfield as a stage one (planes do not "live" there, they come to refuel and the like), so when ALL OF THEM packed and left hastily I don't think Syrians didn't guess the import of this even if they weren't directly told about what was to come.
Besides on one of the pictures of the airfield after the strike an upturned Pantsyr was spotted. So the conclusion is that Russia/Syria did have something to counter the strike with, the question is why they didn't - either they didn't dare or the weapons weren't up to the task (despite the eulogies which had been voiced before).
Perhaps I missed something, so I'm not worried a bit. If you give details I might start to.
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