MiG-29 with American rockets "close the sky" over Ukraine?

The United States is considering the anticipation of utilizing AMRAAM air-to-air missiles on Ukrainian MiG-29 fighters. This would be a very strong reinforcement of their combat capabilities, due to the fact that present they only have russian older generation rockets, and AMRAAMs have already shown effectiveness as ground-to-air missiles. However, fighters request to be upgraded, but the improvement of technology may aid to accomplish this in a short time.