The U.N.'s nuclear energy agency chief says North Korea's actions continue to pose a serious challenge to efforts to stop the spread of nuclear materials.
After delivering his annual report to the General Assembly, Mohammed ElBaradei said he is frustrated by the lack of progress in the six-party talks over North Korea's nuclear program.
The International Atomic Energy Agency chief also urged Iran to suspend its uranium enrichment program to build confidence within the international community.
Mr. ElBaradei did not discuss the recent disclosure of 342 (metric) tons of missing explosives in Iraq, which has become an issue in the U.S. presidential campaign. But he said he hoped IAEA inspectors will be able to return to Iraq to settle lingering questions about Iraq's pre-war weapons capabilities.