(LEAD) U.S. will continue to strengthen cooperation with S. Korea, Japan: State Dept.(ATTN: UPDATES with additional remarks from department spokesperson, more information from 9th para)By Byun Duk-kun WASHINGTON, March 6 (Yonhap) -- The United States will continue to strengthen its trilateral cooperation with South Korea and Japan, a state department spokesperson said Monday, shortly after Seoul and Tokyo announced steps aimed at improving their bilateral ties. Department Press Secretary Ned Price said the U.

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