North Korea said Sunday it flatly rejects the latest set of U.N. sanctions, calling them an "act of war," and pledged to boost its nuclear capability aimed at defending itself.A Foreign Ministry spokesman said the U.S.-led sanctions are a "grave infringement" on the sovereignty of the country and insisted that its nuclear weapons are a "self-defensive deterrence that does not contradict any international law."In a statement carried by the state-run Korean Central News Agency, he said, "We define this 'sanctions resolution' rigged up by the United States and its followers...as an act of war …READ FULL ARTICLE