SEOUL -- North Korea said it has abandoned aid-for-disarmament talks and ordered international monitors out of the country, leaving the U.S. and others to figure out a new way to deal with Pyongyang's pursuit of dangerous weapons.

Coming on the heels of North Korea's latest weapons-related test -- the April 5 firing of a missile-like rocket -- the moves show that Pyongyang can resist international pressure despite its poverty.

North...