Interesting interview with a Ukrainian fighter pilot in which he describes the chaos of the initial invasion and the improvements since.
"As an example, in these early days, Viking's available intelligence on Russian air defenses was scrawled on a piece of map that he'd torn off, with information vital for survival being exchanged by word of mouth between pilots. The map simply showed the best route into a given area, with circles showing the approximate engagement ranges of hostile air defenses.
The primary job at this time was attempting to blunt the advance of Russian tactical aircraft flying from Belarus. "We were the only ones here, to put it bluntly. We were the first line of defense, and they were constantly trying to sneak their Su-34s and Su-35s in at night, at extremely low altitudes."
VIKING