The Chinese plane had already left the islands – known as Diaoyu in China and Senkaku in Japan – by the time the Japanese F-15s arrived.
Although Japan's 2011 Fukushima Daiichi nuclear disaster set much of the public against nuclear power, politicians are not convinced.
Japan's hot spring operators were once vocal opponents of geothermal power, which, along with other forms of renewable energy, is now being considered as an alternative to nuclear power.
Japanese citizens are balking at the lack of information and supervision of waste stored in public places, such as playgrounds.
Chinese naval exercises today simulated a conflict in disputed waters. Tensions between China and Japan have been mounting over claims to a set of islands in the East China Sea.
Aside from national pride, ownership could give Japan or China control of oil and gas resources.
The China and Japan face off over five islands has sunk relations to a 40-year low - the worst since diplomatic relations began. But the sabre rattling is just for show, say analysts.
Boats from China and Japan chased each other around a set of disputed islets, setting off a diplomatic crisis. But when Taiwan entered the fray, neither side seemed to care.