Invasion of Senkaku/Occupation of Diaoyutai?

I was the video clips on Youtube on the recent incident at Diaoyutai. A Chinese fishing boat was crusing in the sea and two Japanese naval came in to shadow it. Then they moved it to sandwich the Chinese ship and one moved into the path of the Chinese ship to cut it off. The provocative manoeuvre was aggressive. Intentional or not it was not easy to move out of the way or stop a ship in motion,