epa01747216 South Korea's Yeonpyeong island fishermen's vessel under convoy fleet in the northernmost coastline (Yellow Sea) on Yeonpyeong Island in Incheon-city, 200km north-west from Seoul, South Korea, 31 May 2009. Yeonpyeong island is about 200km away from the coasts of Seoul. It is the furthermost west of the Korean territory. The North Korea said on 27 May it will no longer guarantee the safe passage of civilian ships, as well as U.S. and South Korean warships, operating along the Yellow Sea border, a resounding threat during peak crab-catching season. EPA/JEON HEON-KYUN