Soldados surcoreanos se preparan para un eventual ataque de Corea del Norte en momentos de gran tensión entre ambos. AP

Tanques surcoreanos en maniobras de preparación ante un eventual ataque de Norcorea en Paju, al norte de Seúl. AP

South Korean protesters burn portraits of North Korean leader Kim Jong Il and his son Kim Jong Un during a rally demanding release of American journalists detained in North Korea, at a park in Seoul, South Korea, Tuesday, June 9, 2009. The sentencing of two American journalists to 12 years in a North Korean labor prison sets the stage for possible negotiations with the reclusive nation for their release _ perhaps involving an envoy from the United States. AP

South Korean protesters hold signs with portraits of North Korean leader Kim Jong Il, left, and his son Kim Jong Un along with placards showing detained American journalists Laura Ling and Euna Lee as they shout slogans during a rally demanding the journalists be released from a North Korean labor prison, at a park in Seoul, South Korea, Tuesday, June 9, 2009. The families of the journalists sentenced to 12 years in a North Korean labor prison urged its hard-line government to grant them clemency, amid hopes the U.S. government would send an envoy to negotiate their release. AP

Portraits of North Korean leader Kim Jong Il, left, and and alleged his son Kim Jong Un are burned by South Korean protesters during a rally demanding release of American journalists detained in North Korea, at a park in Seoul, South Korea, Tuesday, June 9, 2009. The two American journalists arrested in North Korea were sentenced to 12 years of hard labor Monday, but the end of their murky trial could mean the mysterious nation is now ready to begin negotiating their release. AP

South Korean protesters burn portraits of North Korean leader Kim Jong Il and alleged his son Kim Jong Un during a rally, demanding release of American journalists detained in North Korea, at a park in Seoul, South Korea, Tuesday, June 9, 2009. The two American journalists arrested in North Korea were sentenced to 12 years of hard labor Monday, but the end of their murky trial could mean the mysterious nation is now ready to begin negotiating their release. AP