A U.S. Army Patriot missile air defence artillery battery is seen at U.S. Osan air base in Osan, south of Seoul April 5, 2013. North Korea has placed two of its intermediate range missiles on mobile launchers and hidden them on the east coast of the country in a move that could threaten Japan or U.S. Pacific bases, South Korean media reported on Friday. The North has said nuclear conflict could break out at any time on the Korean peninsula in a month-long war of words that has prompted the United States to move military assets into the region. REUTERS/Lee Jae-Won (SOUTH KOREA – Tags: MILITARY POLITICS)