Terminal High Altitude Air Defense ,systems,THAAD which the USA has began to deploy in S.Korea has sparked stow between USA  and China, Russia

The deployment of a short and medium range missile defense system by the USA military on the Korean peninsula have angered both the Chinese and the Russians. This came after N.Korean’s tested four medium range ballistic missile yesterday

TThe system is designed to intercept incoming missile’s and destroyed it midair before reaching the target.Chinese are furious because of the deployment cause the system can snoop into Chinese territory including the controversial south China Sea and it’s artificial islands.

Chinese have responded viciously and warn S.korean of unspecified consequences.