I think Ukraine is a bit unique in how they got the jets. Since they were given the jets during a war, there wasn't much negotiation involved, relative to a country trying to buy plane in peace-time.
In normal peace-time procurement, there is usually significant locally made content required, plus much deeper training. I'd suspect that countries who acquire arms in that way are much more able to continue without US support.
When Iran was still in the US good graces, they bought a bunch of F14s. After their 1979 revolution, they kept operating their F14s. The US actually retired and destroyed all their F14s during the retirement to prevent spares from finding their way to Iran.
In normal peace-time procurement, there is usually significant locally made content required, plus much deeper training. I'd suspect that countries who acquire arms in that way are much more able to continue without US support.
When Iran was still in the US good graces, they bought a bunch of F14s. After their 1979 revolution, they kept operating their F14s. The US actually retired and destroyed all their F14s during the retirement to prevent spares from finding their way to Iran.