China is involved with territorial disputes with a large number of neighbors. China claims almost all of the South China Sea though it Nine-dotted line[0] map. There have been a large number of disputes that have resulted from that[1]. Examples are China's East China Sea Air Defense Identification Zone (ECS AIDZ)[2]. China has threatened to take action against aircraft that don't identify themselves
or obey China's orders[2]. There are many more example in the in-depth The Atlantic article "China's Dangerous Game"[3].
> China is involved with territorial disputes with a large number of neighbors
To clarify, China is militarizing long-standing territorial disputes.
Also note that there is no risk of military conflict between any of the neighbors or between the neighbors and the U.S., despite territorial or other disputes. Vietnam and the Philippines aren't threatening each other, nor are Japan and South Korea, Japan and Vietnam, or any of those countries and the U.S. But almost everyone seems to be in a militarized dispute with China.
[0] - http://en.wikipedia.org/wiki/Nine-dotted_line [1] - http://en.wikipedia.org/wiki/Territorial_disputes_in_the_Sou... [2] - http://news.xinhuanet.com/english/china/2013-11/23/c_1329116... [3] - http://www.theatlantic.com/magazine/archive/2014/11/chinas-d...