On the 19th, North Korea is suspected of having tested a cluster missile. This move, seen as a real-time challenge to Japan's security calculus, is typical of the hermit kingdom's defiance of international non-proliferation norms. Although there is no immediate danger to Japan, Tokyo is closely monitoring the situation while concurrently notifying its allied counterparts internationally.

Japan takes such incidents very seriously considering the proximity and historical friction with North Korea. This event stokes Japanese concerns over its national security and stability in the East Asia region. Missile tests like these also challenge Japan's pacifist constitution and raise debates over its self-defense capabilities.

Unlike in the US or EU where physical distance provides some level of comfort, Japan's geographic proximity to North Korea makes these tests a greater security concern. This event is treated similarly to how the US might respond to a Cuban missile test, evoking immediate diplomatic and possible remilitarization discussions.