North Korea crisis: Japan prepares for possible attack
12 April 2013 Last updated at 16:46 BST
Japan is preparing to defend itself against any aggression from North Korea, setting up Patriot missiles in the capital and deploying warships.
North Korea has moved two missiles to its east coast, as it continues to build tension in the region.
Japan's defence minister Itsunori Onodera has described North Korea's rhetoric as "completely unacceptable".
Martin Patience reports from Tokyo.