Those failed to protect Russian base in Syria even against low-quality homemade drones.
From earlier this year with pictures: https://www.independent.co.uk/news/world/middle-east/russia-...
There were several attacks repelled in the last month also but I only have Russian language sources (maybe South Front will have some more details in English - coverage of Syria in Western media has been pretty sparse in the last months with all the government successes in Daraa).