From the Dec. 17, 2013 provisional translation of the Japanese National Defense Program guidelines:
While the probability of large-scale military conflicts between major countries presumably remains low, various security challenges and destabilizing factors are becoming more tangible and acute. As a result, the security environment surrounding Japan is becoming increasingly tense since the 2010 Guidelines.
As the security challenges and destabilizing factors are diverse and wide-ranging, it is difficult for a single country to deal with them on its own. It is increasingly necessary for countries which share interests in responding to such security challenges to actively respond in collaboration with each other for regional and global stability.