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.

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.

The sanctions have affected one very-large crude carrier (VLCC) and two Aframaxes that the Treasury Department said helped move Iranian oil to China.