In his now famous speech, Putin revealed some of these new weapons systems, although he did not say much about how they would be engaged (which is quite logical, since he was making a political speech, not a military-technical report). For those would be interested in this topic, you can check here, here, here, here, here and here.
The recent Houthi drone and missile strike on the Saudi oil installations has shown to the world something which the Russians have known for several years: that even rather primitive drones can be a real threat. Sophisticated drones are a major threat to every military out there, though Russia has developed truly effective (including cost-effective, which is absolutely crucial, more about that later) anti-drone capabilities.