China joins U.S., Japan, EU in condemning North Korea nuclear test

SEOUL (Reuters) - North Korea conducted its third nuclear test on Tuesday in defiance of existing U.N. resolutions, drawing condemnation from the United States, Japan, Europe and Pyongyang's only major ally, China, which summoned the North Korean ambassador to protest.

The North said the test had "greater explosive force" than the 2006 and 2009 tests. Its KCNA news agency said it had used a "miniaturized" and lighter nuclear device, indicating that it had again used plutonium which is more suitable for use as a missile warhead.