There are plenty of fixed, soft, prized targets spread along and within the entire length of Chinese coastal regions.Even if they overload some air defenses Chinese targets are so distributed and will have enough warning time that they can scatter by the time the JASSM would hit. It might at most be able to take out a few dozen J20s if it gets really lucky but what else could it do?
Ports, train stations, runways, fuel depots, expressway overpasses, electrical substations, shipyards, you name it.
Of course, the US&LC will have to expend lots and lots and lots of JASSMs in order to target these. But China also has to defend every kilometer of her airspace along the entirety of the Chinese coastline, and expand that AoR both inwards and outwards.
There is also never a 100%-interception rate guarantee for any air-defense systems anywhere around the world.
The attrition is going to be quite heavy for both sides.
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