Just a small piece of reality, every Russian Tank Bde has an air-defense btln, every Motor-Rifles Bde has two (1 pure SHORAD one with tac-SAMs). In a given battlespace they'd be linked together with a system called Barnaul, that also talks to local PVO (air-defense) command, and ultimately fighter CAPs. Even in Georgia (that war was a cluster-f*ck) armor columns always had Tunguska-Shilka class systems, and even buckets of ZU-23-2s and MANPADS. In '14-'15 the Russian 200th MRB in Eastern Ukraine also used Tunguskas, and they were probably linked up to Russian Tor-M1 and Pantsyr-1S systems also in Ukraine at the time. Even in Syria the Russian field camp in Palmyra, set up so some EOD guys could help clear the city of IEDs, with 0 ISIS airpower threat, the camp was covered by Pantsyr-1S systems, and Flankers regularly flew CAPs over the area. Hopefully this illustrates what ngati was saying above.
Your general point on the vulnerability of UAVs against a high-tech conventional enemy is valid, but helos are every bit as vulnerable, and have expensive human pilots inside of them.