(LEAD) U.S. troops should stay in S. Korea for long time even after peace treaty signed: Ahn
(ATTN: UPDATES with more info throughout)
SEOUL, June 4 (Yonhap) -- Ahn Cheol-soo, a Seoul mayoral candidate, said Monday that the United States should maintain its troops in South Korea "for a considerable period of time" even if a peace treaty to en