Foreign Minister Ban Ki-moon has casts doubt over prospects for a timely reconvening of six-party talks on North Korea's nuclear issue, following Pyongyang's criticism of a uranium enrichment program conducted by South Korean scientists four years ago. North Korea accused the United States of applying what it called "double standards" in its dealings with the two Koreas, condemning Washington for overlooking South Korea's uranium enrichment experiment while trying to pressure Pyongyang over the North's nuclear weapons program. The North made the comment through its diplomats overseas a week after Seoul admitted that there had been a one-time "academic" experiment in 2000 that resulted in the production of 0.2 gram of enriched uranium. On Wednesday Han Song-ryol, a North Korean delegate to the United Nations, said the experiment was "threatening," and claimed that it was aimed at developing South Korean nuclear arms. The diplomat also said his country no longer feels the need to hammer out a deal on its nuclear program with the United States. Han's comments, which came amid growing pessimism over the prospects for a new round of six-party talks, comprises a further setback to efforts to convene the meeting later this month, as previously agreed. Foreign Minister Ban said Thursday it is too early to determine whether North Korea's latest comments translate into the country's formal refusal to attend the six-nation nuclear dialogue. Ban also said South Korea has nothing to hide regarding its uranium enrichment program and that members of the International Atomic Energy Agency