The Japan Coast Guard on Monday released a condensed 30-minute video of its failed attempt to prevent activists from Hong Kong from making an unauthorized landing on the Senkaku Islands on Aug. 15.

"We decided to release the video to show that the coast guard took appropriate measures against the protesters," said Takahiro Okushima, director of the Japan Coast Guard's Territorial Waters Guard, Security Division.

The video was edited down from about seven hours of footage that began at 11:52 a.m., when the patrol boats started transmitting footage to coast guard headquarters, and ended at 6:50 p.m., when they took control of the Hong Kong fishing boat after the cat-and-mouse chase.