Diplomatic Row

Some Chinese activist went ashore on one of the Japanese Senkaku Islands in the East China Sea. When they were arrested by Japanese Coast Guard, China made a diplomatic protest. I understand why. China is a dictatorship and claims these islands. It is in the line of dictatorial regimes to claim other states' territories, because they believe imperialistic policies look good to their own people and takes peoples' interest away from internal affairs. I still think China has no claim to the Senkaku Islands. Why would they? They are a part of the Okinawa prefecture in Japan and this was the first time for many years that any non-Japanese people had ever visited them. There is no basis for the Chinese claim.