It seems that the U.S. has been studying Japan's nuclear weapons for 40 years. Japan has enjoyed peace under the US umbrella, and the US no longer considers Japan a threat. It perceives China as a threat.
If it is on our side, it would be in the U.S. national interest to have Japan go nuclear, as it would help to curb the Chinese threat.
It is inconvenient for both China and North Korea because they will not be able to attack Japan easily if Japan becomes nuclear-armed. They are desperately trying to incite and fund the Japanese media and leftist forces in Japan to adhere to the three non-nuclear principles.
How does Japan's nuclear armament look to Russia, which is currently in a critical situation due to its invasion of Ukraine? Russia would welcome a nuclear-armed Japan. From Russia's perspective, it is not in its national interest that Japan is monolithic in its military alliance with the U.S. under the Japan-U.S. Security Treaty.
However, if Japan becomes nuclear-armed and achieves true independence, taking a few steps apart from the US's dictates, it will mean that there will be room for negotiations. As it is now, if Russia invades from the Northern Territories and China simultaneously invades from the Senkaku Islands, the situation could be the same as in Ukraine today.
It is time for the Diet members to start the debate immediately. First, the Constitution should be revised. Then, the Self-Defense Forces must be formally established as Japan's military force and the debate on nuclear armament must begin, or Japan could be plunged into a crisis. We should recognize that we are no longer in an era of peace.