It’s not a fair fight anyways. Ukraine has (or had) an air force. Those who are seeking their independence don’t. The separatist did capture one plane I believe.
Why don’t you ask the pilots of the planes being shot down if the fight is “fair.”
The Rebels shot 2 jets down with “air to air missiles” apparently, that would suggest the “rebels”/insurgents/Russian agents have some jets or something. Or maybe these were shot down by the Russian Air Force.