Japan has lodged a diplomatic protest against China amid allegations of an unsolicited radar jamming incident. Japanese officials claim the interference to be a hazardous act that undermines the safety of navigation. China has reportedly reacted strongly against the Japanese protest. The matter has escalated existing political tensions between the two East Asian countries. No specific timeline or location of the occurrence was mentioned in the headline.

Radar interference is perceived as a serious risk not only to national security but also to the safe navigation of maritime transport, and this incident hence brings concern among the Japanese public. It also inflames Japan's ongoing territorial disputes with China, especially in the East China Sea. The news can potentially add to the existing nationalistic sentiments in Japan against China, framed within a broader geopolitical landscape.

In the US or EU, radar interference from a foreign nation would also be taken with severe concern. It would invigorate diplomatic measures and potentially trigger talks for sanction or repercussions. In a broader scenario, such actions could imply military threats, heightening tension between the countries involved.