Japan is in ongoing contemplation and discussions around the future development of America's nuclear systems. The interest is driven by the role these systems play in terms of global security and Japan’s protection under the lay of the US nuclear umbrella. The matter centers on the modernization and potential upgrade of these systems. There's an increasing need for dialogues and reassurances from both sides to understand the broader implications and potential changes.

The Japanese community displays a high interest in the stability of US military systems because of its geopolitical situation and historical experiences. Following the end of World War II, Japan adopted a pacifist constitution and has been relying on the US for its national defense. Any changes in the status or capability of the US military machinery, particularly its nuclear arsenal, significantly influence Japan's national security perspective.

In contrast to Japan, the United States and countries in the European Union have direct control over their national defense. The US has been on a modernization drive for its nuclear assets for some years now. In the EU, while many countries are Nato members and benefit from the US nuclear umbrella like Japan, countries such as the UK and France maintain their nuclear arsenal.