The Russo-Syrian claim is that the missiles that got through were mostly targeting non-functioning and consequently unprotected facilities. However I have my doubts. The Pantsyr S1 is certainly capable of shooting down cruise missiles, and under the right circumstances so is the Buk-M2. But these results are far better then what I would expect from the Syrians. Protecting against a small Israeli missile strike is one thing but this was much bigger.