An oil rig owned by China National Petroleum is currently in North Korea’s exclusive economic zone (EEZ) in the Yellow Sea off the country’s western coast, data from ship tracking website Marine Traffic shows.

The rig arrived at its current location just within the North’s EEZ in late May and is only a short distance from a series of exploration wells found to yield oil in the 80s and 90s.

The platform’s presence in the DPRK’s EEZ could indicate that Beijing is showing renewed interest in a memorandum signed in