[Afterguard]

Simple answer. No.

Even if the Russians develop a Gen5 fighter they do not have the resources to build enough of them to survive US air superiority for long enough to make a difference in a conflict (that is, if the US remains committed to the conflict).

Now the Chinese may be different story. They have far greater resources and most of their tech has been provided by us at the approval of previous presidents, starting with BJ Clinton.

Just my $.02.

[AppyPappy]

If they build them, they sell them.

[AndyJackson]

One of the things is not the capability of your most advanced fighter, a fighter that you cannot build and cannot keep flying if you do build it. The strength of the USAF is that it is a very effective - well for a military agency = system of using large numbers of advanced fighters in sustained operations including the tactics, logistics, maintenance and training required to keep them operating.

I'm ex Navy and don't want to say anything nice about the Air Force. Still they aren't half bad at their job.

[caprock]

Yep. Billy-Jeff provided the latest nuclear weapon designs and launch vehicle expertise along with whatever else. Obambi probably supplied more when he wasn’t focused on assisting his fellow muzzies.