- An expert said the Russian air force is being depleted through overuse in Ukraine.
- The arrival of Ukraine's F-16s could worsen the problem, wrote Rand's Michael Bohnert.
- Ukraine says it urgently needs F-16s to reduce Russia's air dominance.
Russia's fighter planes are malfunctioning because of overuse, handing Ukraine a potential advantage in its air battles against the Russian air force, an expert said.