The foreign affairs and defense chiefs of Japan and the United States agreed Thursday to revise bilateral defense cooperation guidelines by the end of 2014 so the joint security alliance reflects rising threats in the Asia-Pacific region.

In the "two-plus-two" meeting, in which the participants for the first time in Tokyo involved all the heads of their respective ministries, the four agreed that the guidelines, last revised in 1997 to outline how the Self-Defense Forces and U.S. military should cooperate, must be changed to take into account the North Korean ballistic missile and nuclear threats, as well as cyber-attacks and terrorism.

Foreign Minister Fumio Kishida and Defense Minister Itsunori Onodera and their American counterparts, Secretary of State John Kerry and Defense Secretary Chuck Hagel, also confirmed that steps would be taken to reduce the concentration of U.S. military bases in Okinawa.