A Chinese vessel was reportedly spotted in the Exclusive Economic Zone (EEZ) off Tokunoshima, Japan, possibly conducting a maritime survey. While the purpose of the vessel's incursion has not been confirmed, such activities typically involve studying biodiversity, mineral reserves, or navigation routes. The event occurred despite the ongoing maritime disputes between Japan and China.

Maritime issues are a sensitive topic in Japan due to its numerous island territories and the fact that it's surrounded by sea. The presence of a Chinese vessel in Japan's waters can spark concerns over sovereignty, etc. Japan's Exclusive Economic Zone is an important legal construct for the nation's control over its surrounding seas and any breach is considered a serious matter.

In the US or EU, any foreign vessel entering the territorial waters without explicit permission would also be seen as a violation of maritime boundaries and could potentially escalate tensions between the countries involved. They also strictly monitor their maritime territories, enforce their rights in line with international law, and value diplomacy as a way to resolve maritime disputes.