The sanctions, which expire April 13, include banning all imports from and exports to North Korea. Japan has been imposing its own punitive measures on North Korea since July 2006 following Pyongyang's long-range missile test.
The extension by the Cabinet of Prime Minister Yoshihiko Noda comes at a time when North Korea is preparing for the launch of a satellite on a long-range rocket to mark the centennial of the April 15 birth of its founder Kim Il Sung.
Japan and many other countries believe that the planned launch in mid-April is actually a test of a long-range ballistic missile in violation of U.N. Security Council resolutions.
Japan is exploring the possibility of introducing additional punitive measures if North Korea goes ahead with the launch, according to government officials. Source