SEOUL, June 13 (Yonhap) -- North Korea said Saturday it will start enriching uranium and weaponize all new plutonium, protesting the U.N. Security Council resolution expanding sanctions on it. The North, which triggered the resolution after its second nuclear test on May 25, also said it will "respond militarily" if the U.S. and other countries attempt what it called a "blockade." The resolution calls on states to conduct inspections of North Korea ships suspected of carrying materials related to weapons of mass destruction.