As Japan marks the anniversary of the 1945 atomic bombs, its leaders are pushing for a renewed debate on nuclear weapons in a challenge to the nation's long-time pacifist stance.
Japan's constitution renounces offensive military force, and successive governments have maintained a decades-old pledge not to possess nuclear weapons, produce them or permit their introduction into the country.
That commitment is now under pressure as East Asian neighbours — notably China — boost their military capabilities, while doubts persist about the reliability of Tokyo's biggest security backer, the United States.
Japan Prime Minister Sanae Takaichi has refused to clarify whether she will maintain the stance known as the three non-nuclear principles, and Defence Minister Shinjiro Koizumi called last month for a "discussion without a taboo" on the subject.
In December, an unnamed senior administration official told local media in an off-the-record session, suggesting that Japan should possess nuclear weapons.
