The air power thing is a real problem. F-16s and Western aircraft in general are something of a challenge. 1. Ukraine airfields are austere like all soviet era airfields. They are used to ignoring runway maintenance. FOD (Foreign Object Debris) is cleared out of the way so the ultra complex GE and Rolls Royce engines on Western fighters can operate without having stones and birds and deer sucked into the engines.
So, the Ukrainian airforce wants F-18s which apparently were modified in 2009 to have improved resistance to FOD and 2. The F-18 has two engines which give the airframe better survivability.
That was one of the primary considerations of the Canadians when they chose the F-18 back in the day. Long distances and arctic conditions meant they wanted their pilots to have a second motor to row the boat home in the event of in-flight emergencies. I worked in an F-16 unit at Selfridge back in the day. That plane had a very perilous situation when the engine went out. They had a back up power unit control the electric controls so it could at least control its flight surfaces. When that backup power unit was engaged it triggered an automatic checklist with the EPA because the weird substance used was highly toxic. F-16: wonderful dogfighting aircraft, not as expensive as bigger models, but i'd rather have two engines.