President Donald Trump said Monday that the U.S. is still actively pursuing an oil tanker linked to Venezuela, but that he's confident the vessel will be seized.

Crude futures pick up from early losses and add to yesterday’s gains as the U.S. steps up actions in the Caribbean to cut off Venezuela’s oil trade and increase pressure on the country’s strongman Nicolás Maduro.

The fleet of ghost ships Venezuela uses to smuggle part of its oil to black markets, which President Donald Trump vowed this week to stop with a military blockade, is made up of dozens of old tankers and operates following the example of other nations under sanctions such as Russia and Iran,