text: S.Korea FM: No Optimism on Nuclear Talks with North  SEOUL (Reuters) - South Korea is working with its  diplomatic partners to try to hold nuclear talks with North  Korea this month, but recent North Korean comments suggested no  grounds for optimism, the South's foreign minister said on  Friday. There are plans to hold a fourth round of nuclear  negotiations among the two Koreas, the United States, China,  Japan and Russia by the end of September as the countries  agreed at the previous session in June.