From "The Analyst":

AIRBASE STRIKES SUCCESS

Ukrainian drones struck at least two airbases successfully last night. I’ve been waiting to see the latest figures but we may have to wait a little longer to be absolutely sure of the totals of Russian aircraft lost, but it’s looking like it’s between 12 and 18.
Ukraine knows it has to make the front line airfields untenable- and the Russians know it too, so they are quite well defended. As Russia has learned from the experience of attacking Ukraine, Ukraine has in turn learnt from Russia how to approach such targets.
Unquestionably drones were shot down, that was expected and what usually happens is that enough arrive in two formats - firstly the all at once method, where so many arrive at once they can’t possibly be all shot down, or that sacrificial drones go in first to wear down the air defences and the second wave arrives just as the missiles run out and have to be reloaded.
Even so, there’s outrage in Russia that they haven’t been able to produce or even start to organise, simple Ukraine style man on a pickup truck with machine gun defences. These have been successful in Ukraine but Russia seems incapable of producing them.
It’s become such a bind for the oil refinery companies that they have been paying for their own anti-drone equipment and hunting around the world for it wherever they can buy it at any price.
A third airbase was also reached - outside of Saratov, which is much deeper inside Russia - but this seems to have been a recon/probing operation more than a straight up mass attack.
Again the tactics Ukraine are employing are designed to keep Russian air defences on their guard and uncertain. What do you defend? The refineries? The air bases? There’s only so many defence systems to go around - and they’re not on the front line leaving that as another operational area open to attack.
The Russians seem taken aback by the fact their own tactics and strategies have been adopted so quickly and effectively by their victim. What did they expect? Not this I think. They have forgotten the old but always relevant rules of war.
If you can’t win don’t fight. And if you do fight when you know you can’t really win, don’t be surprised that the victim of your attack uses your own ideas and weakness against you.

Slava Ukraini 🇺🇦!