The United States said Monday that China's test-firing of a nuclear-capable ballistic missile from a submarine was of "great concern" to Asia and the rest of the world.In response to the test conducted around 20 hours earlier, the U.S. State Department released a statement urging China to curb nuclear proliferation and reiterating Washington's defense commitments to its allies."Beijing's rapid and opaque nuclear weapons buildup is of great concern to the region and the world," it said.According to China's military and official media, the country's navy on Monday successfully test-fired a st…READ FULL ARTICLE