The U.S. on Thursday imposed sanctions on a network of more than a dozen people and firms that are accused of facilitating the shipment of millions of barrels of Iranian oil to China.

President Donald Trump’s maiden sanctions package targeting a handful of vessels carrying Iranian oil stopped short of the “maximum pressure” campaign his administration had pledged, according to shippers and analysts.

According to the state department, the sanctions target a network that is bringing “illicit revenue to the Iranian military” through a front company, Sepehr Energy. Also included are a shadow tanker fleet and management companies that facilitate the supply of oil to China,