North Korea on Friday launched a scathing attack on US Secretary of State Mike Pompeo, calling him a “diehard toxin” and saying it was “sceptical” whether it can negotiate with him. Pyongyang also vowed to remain the United States’s “biggest ‘threat'” and said annual US-South Korea joint military drills had “complicated” nuclear talks between the two countries. “We are ready for both dialogue and stand-off,” North Korea’s foreign minister Ri Yong Ho said in a statement.