It won't have to be in their own littoral. The Chinese said the J-20 can get to Guam (I assume back too). If it can do that it can threaten air routes to Taiwan, northern Philippines, all of Vietnam and more. We depend on transports and tankers not being threatened and if they are I don't know what we would do. There aren't enough F-22s to protect all that space.
I'm am not concerned about fielding a superior force, I'm concerned about not fielding a force that can match the J-20s capabilities. F-35s and the latest iteration of the 70s forever fighter, the F-18, aren't going to be able to deal with that thing I fear. F-84s vs. MiG-15s redone, with no Sabres to the rescue.
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