BY TAKASHI OSHIMA CORRESPONDENT
This Nov. 23 satellite file image provided by DigitalGlobe shows the Sohae Satellite Launch Station in Cholsan County, North Pyongan Province, North Korea. Rocket sections are apparently being trucked into North Korea's northwest launch site. (AP Photo/DigitalGlobe, File)
WASHINGTON -- Japan, the United States and South Korea are considering asking the United Nations Security Council to strengthen sanctions against North Korea if it carries out its threat to launch a rocket.