Too late Manoa_Fisherman,  The North Koreans after building all those Under Mountain Cities that are Nuclear Attack Proof believe they can survive Thermo Nuclear World War 3, just like the Iranians after building their Under Mountain Nuclear Attack Proof Cities, the U.S.S.R. after they built the Ural Mountain Complex (Under and In Mountain Nuclear Attack Proof Cities).  U.S. does not have Earth Penetrator Nuclear Weapons to kill these anymore.

As far as the South China Seas "Disputed Islands" too late all the Chinese Peoples Liberation Army Navy Air Force has to do is install their Long Range (over the horizon) Hypersonic and Supersonic Anti Ship Missile Batteries ,they already installed the Chinese Version of the S-400 Anti Aircraft and ABM Missile Batteries (same kind that detected the U.S. Generation 5 Stealth RQ-170).  Chinese may have already installed their Rocket Assisted Self Rising Underwater Mines, a Underwater Stealth Guided Missile anchored to the Sea or Ocean floor..