(LEAD) Foreign minister Yun dissuades Tillerson from reward-for-nuclear freeze deal with N. Korea: sources
(ATTN: UPDATES with more detils in last 4 paras)
SEOUL, Feb. 21 (Yonhap) -- Foreign Minister Yun Byung-se has voiced South Korea's reservations about any U.S. agreement with North Korea that would reward Pyongyang for a nuclear freeze, sources said Tu