1.) Control problem.

2.) Yes, unusually successful.

1.) Control problem. Seems, Iranians were unable to deliver enough control stations, and the Russians are in a rush.

2.) Yes, unusually successful.

3.) Think it's a combination of the Russians carefully checking the work on the Ukrainian air defences, and striking by night, plus the fact that the readiness rates of the Ukrainian Air Force are decreasing because ever less aircraft remain operational.