"The specter of Chinese warplanes buzzing U.S. and Japanese planes adds urgency to U.S. pressure for high-altitude defense in Asia against a still more formidable threat: that of missiles fired by North Korea and maybe even China.
Both the Pentagon and Japan's defense ministry have protested the close calls with Chinese planes while China threatens still more of them and complains about U.S. dreams of installing a "Terminal High-Altitude Area Defense" system in South Korea."
Russia and China and North Korea play a very dangerous game... Spurring on America is rather short sighted. Can have unexpected consequences from unexpected places internal to these countries.
http://www.forbes.com/sites/donaldkirk/2014/08/29/u-s-high-altitude-missile-system-for-s-korea-upsets-china-russia-n-korea-poses-problem-for-south/