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Tokyo (CNN) -- Three Chinese ships entered into Japanese territorial water near the disputed Senkaku Islands on Friday morning and were staying despite a warning from a Japanese Coast Guard ship, the coast guard said.

In response, Japan sent eight jet fighters and another plane to the area, according to Japan's Defense Ministry.

The move continues a dispute between the nations that stretches back decades.

Last week, Japan also scrambled fighter jets near the small islands in the East China Sea after a Chinese plane was seen there.

Chinese government ships have repeatedly entered the waters around the remote, rocky islands since the Japanese government announced in September it was buying several of the islands from private owners.

Japanese Coast Guard vessels have engaged in games of cat and mouse with the Chinese ships, with both sides broadcasting messages to one another insisting they have territorial sovereignty over the area.

Analysts say that by sending its own patrols into the area, China is challenging Japan's de facto control of the islands, which has been the status quo for the past 40 years.