In the separate operation Saturday, the Coast Guard boarded a Panamanian-flagged oil tanker named the Centuries that had been docked in Venezuela, according to Homeland Security Secretary Kristi Noem. The Centuries wasn’t included on sanctions lists from the U.S., U.K., European Union or the United Nations, according to shipping data firm Kpler.

The tanker, which had been sailing to Venezuela to pick up oil, has claimed Russian protection, although the U.S. authorities say it is a stateless vessel.