MiG-29s with US missiles will “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 strengthening of their combat capabilities, due to the fact that present they only have post-Soviet rockets of the older generation, and Amraams have already proven to be effective as surface-to-air rockets. However, fighters request to be modernized, but thanks to the improvement of technology, this may be achieved in a short time.