See How China Is Gaining Power in Contested Waters - Chinese fishing vessels pushed within 150 miles of a U.S. naval base in Japan last month, the latest maneuver in a decades long campaign

About 200 Chinese fishing boats—part of China’s state-directed maritime fleet—recently pushed further east in the Yellow Sea. Some came within 150 miles of the Japanese city of Sasebo, home to a core U.S. naval base, according to ship-tracking data provided by geospatial analysis firm ingeniSPACE and verified by The Wall Street Journal.