Chinese Fishing Boats Invade

Over 200 Chinese fishing boats have invaded Japan's EEZ to steal coral illegally. I watched some videos on TV about the incidents. There were many rusty iron boats searching and stealing valuable red coral. 

How many miles do they travel for the coral? I don't know they can get enough money for the fishing. 

Japan's coast guard's vessels are too busy to arrest them or make them away from the area. 

I think they come to the area not only for stealing coral but also for the will of Chinese authorities' to annoy Japanese government. Japanese government should enlarge the number of coast guards for protect Japan's sea areas.