Okay. China built some islands with the clear intention of expanding its’ influence. Since no one did more than wage a finger at them and say, “Naughty, nautghy” it is now a done deal. Only a hot war could stop them from using the islands. A hot war is probably not a good idea. So, what to do.
How about POTUS Trump offer to build fancy hotels on the islands for certain compensations. Say, removal of all military armaments. Tell them that the U.S. would offer to help China protect the islands from agression if China would stop making agressive moves against Japan or Korea or the Phillipines. China would have to agree not to build any more islands.
Offer to help Japan build islands off of their coasts. If China can do it, why not Japan.