(LEAD) N. Korea foreign minister meets senior U.N. official in Pyongyang
(ATTN: REMOVES the word "brief" before talk in 2nd para) SEOUL, Dec. 7 (Yonhap) -- North Korean Foreign Minister Ri Yong-ho had a meeting with a senior U.N. official in Pyongyang, the North's official news agency KCNA reported Thursday. Ri had a