A pedestrian picks up a newspaper reporting the clash of North and South Korean navies in Seoul on November 10, 2009. A North Korean patrol boat was set ablaze after exchanging fire with South Korea's navy on November 10, Seoul officials said, as cross-border tensions rose a week before a scheduled US presidential visit. Getty Images logo Getty Images 1 week ago

A pedestrian picks up a newspaper reporting the clash of North and South Korean navies in Seoul on November 10, 2009. A North Korean patrol boat was set ablaze after exchanging fire with South Korea's navy on November 10, Seoul officials said, as cross-border tensions rose a week before a scheduled US presidential visit.