DUBAI (Reuters) - Iran will not stop higher-grade enrichment of uranium in response to external demands, Tehran's top nuclear official was quoted as saying on Tuesday, signalling a tough bargaining stance ahead of planned new talks with world powers.
Western powers want Iran to halt enrichment of uranium to a fissile concentration of 20 percent as it represents a significant step closer to the level that would be required to make nuclear bombs. Iran says it needs uranium refined to 20 percent to run its medical research reactor in Tehran.