They have not failed - not sure where you get your information from. Maybe you are confusing with the mortar attack earlier this year? From earlier this year w

They have not failed - not sure where you get your information from. Maybe you are confusing with the mortar attack earlier this year? From earlier this year with pictures: https://www.independent.co.uk/news/world/middle-east/russia-military-bases-drones-syria-armed-attacks-tartus-uavs-latakia-a8151066.html 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).