They have those already and they’re getting more, but the issue is the radar on a”modernized” MiG-29 is still not as good as a Su-35 or any American F-Series jet. A MiG-29 doesn’t have the range to take out a MiG-31 traveling at Mach 2.8 at 80,000ft firing R-77M and R-37M hypersonic missiles. The Russians have scored some VERY long distance kills with the MiG-31. They need the American AMRAAM.