Washington's incoming national security adviser is warning that the U.S. must be on alert as North Korea could be increasing its nuclear and missile capabilities while it buys time through negotiations. <br /> Giving a radio interview on Sunday,... John Bolton said Pyongyang is concerned about U.S. pressure on the regime. <br />He also said new U.S. tariffs imposed on China over its unfair trade practices could serve as a "little shock therapy,"... adding that Beijing has been taking advantage for too long. <br />Bolton, a former U.S. ambassador to the UN, was named to replace H.R. McMaster last week. <br />
