Stalin called artillery the god of war. Ranged surface-to-surface weapons are the antithesis of close combat, and whoever has the systems with the highest range and military effectiveness can clear the way ahead of physical occupation until political or economic forces compel suing for a negotiated cessation of hostilities.
While Ukraine is training F-16 pilots, this will take a lot of time and money to achieve and sustain, and is vulnerable to parts supply chain issues, maintenance program sophistication gaps, and puts expensive-to-train pilots at risk of loss by being shot down. Vipers will barely move the needle on the course of the current conflict, but will enable Ukraine to defend its territory and airspace without direct NATO intervention.
The domestic Ukraine drone and missile industry is another leg of the table on which Ukraine will advance and sustain self-defense by striking strategic Russian military logistics, naval, army, and air force targets.
> Even though Russia has got the bigger air force
Russia's military is barely functional due to corruption and complacent reliance on being a nuclear superpower. The % of operational jets is barely enough to sustain territorial defense much less a sustained "special military operation". Russia's air assets total 3000 pieces of equipment but with only 7 regular air bases close enough to launch strikes and could only muster around 250 operational strike aircraft given the limitations on maintenance, storage, and the few pilots.
185 fighters
264 attack aircraft
415 multirole
119 bombers
1000+ helicopters
1000 transport
177 others (EW, a few tankers, c3)
https://youtu.be/geSvbR9io3c