(LEAD) N Korea-US nuclear sub visit (ATTN: UPDATES throughout with more remarks) SEOUL, July 20 (Yonhap) -- North Korea's defense chief warned Thursday a U.S. nuclear-capable strategic submarine's port visit to South Korea this week may fall under the legal conditions for his country's use of nuclear weapons. Defense Minister Kang Sun-nam made the remarks, issuing an anticipated criticism of the visit here by the USS Kentucky, an 18,750-ton Ohio-class ballistic missile submarine (SSBN), and the inaugural meeting of the South Korea-U.

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