<br /> North Korea’s chief negotiator slammed the South Korean government Thursday.<br />Denouncing its joint air combat drills with the US, Ri Son Gwon called it “ignorant and incompetent."<br />Ri threatened to halt all talks with the South unless North Korea's demands are met.<br />He also criticized the South for allowing “human scum” to speak at its National Assembly.<br />Ri's comments mark a huge setback in the runup to a summit scheduled with the U.S. <br />
