This article provides an expert analysis on the current state of Japan's nuclear weapons program and its future prospects. Japan has had an interest in nuclear technology since the early 20th century, but was unable to develop any significant capability due to a lack of resources and expertise. Since signing the Nuclear Non-Proliferation Treaty (NPT) in 1967, Japan has adopted a policy of non-nuclear weapon possession and non-nuclear weapon production known as "Three Non-Nuclear Principles". It is believed that Japan has some capacity for producing nuclear weapons should it choose to do so, but is highly unlikely given its commitment to non-proliferation and membership in the NPT regime. The international community plays an important role in regulating Japanese nuclear weapon activities through organizations such as the International Atomic Energy Agency (IAEA).