American F-35s encounter Chinese J-20s over the Pacific

While the J-20 is not as stealthy as the F-35 and especially the F-22, the danger is being illuminated by their AWACS or ground-based LF radar, and that information being shared with the J-20 which can either fire a Mach 4 long range missile based on the targeting information it received, or be vectored for a visual range confrontation.