The combat range of both is less than diameter_pacific/2 so they are pretty safe.
The US doesn't have any enemies within range of the Chinese jets and the US won't sell the F22 to anybody near china.
They are both techno-wank projects to make generals feel cool and to keep a few aerospace companies in business. It took a while but we have finally corrupted them to be just like us - and we did the chinese as well!