Top NewsMost ViewedKorean Newspaper HeadlinesToday in Korean HistoryYonhap News Summary(ATTN: UPDATES with S. Korea's JCS explanation throughout)SEOUL, April 16 (Yonhap) -- A South Korean Navy vessel fired warning shots to drive out a North Korean patrol boat that crossed the western de facto maritime border last week, the South's military said Sunday. All NewsNationalNorth KoreaEconomy/FinanceBizCulture/K-popSportsImagesVideosTop NewsMost ViewedKorean Newspaper HeadlinesToday in Korean HistoryYonhap News SummaryKorea in BriefUseful LinksFestival CalendarWeather