Venezuela's exports of crude and fuel rose in February to their highest since November, vessel monitoring data showed, as the U.S. prepared to terminate a key license that allows oil major Chevron to operate and ship crude from the country.

The move — announced by Trump in a Truth Social post last week — will be a major blow to Venezuela. Chevron produces about a fifth of Venezuela’s crude annually, according to analysts at the Rystad Energy research firm, and losing the ability to export to the U.S. will be a blow to the country’s already floundering economy.

A permit issued by the United States government allowing energy giant Chevron Corp. to pump and export Venezuelan oil will be terminated this week.