In other words NK has given us a good excuse to beef up our missle defense, which China does not like B/C it could also be used to defend ourselves against them.
http://www.cnn.com/2013/03/18/world/asia/china-us-north-korea/index.html?hpt=hp_t2
http://www.cnn.com/2013/03/18/world/asia/china-us-north-korea/index.html?hpt=hp_t2
The 14 additional interceptors, to be installed by 2017, would bring the total to 44, according to the Pentagon.
"The reason that we are doing what we are doing and the reason we are advancing our program here for homeland security is to not take any chances, is to stay ahead of the threat and to assure any contingency," Hagel said.
Concerns about regional stability
But Hong said Monday that China believes that the anti-missile issue "matters to global strategic balance and regional stability. It also matters to strategic trust between relevant countries."