(CNN) — The Trump administration’s seizure of an oil tanker off the coast of Venezuela is one of the most dramatic twists yet in a military pressure campaign against Venezuelan dictator Nicolás Maduro.

The boarding of a foreign ship is an unusual step and expands a US operation already highlighted by strikes against more than 20 boats in the Caribbean and Pacific Ocean that the administration claims carried drug traffickers.

Early reports suggest the swoop by US Coast Guard personnel, with the backing of the Navy and law enforcement agencies, poses fewer legal and constitutional concerns than the campaign against the boats and Trump’s imminent threats of military action on Venezuelan soil.

The vessel, the Skipper, was seized in international waters and was carrying Venezuelan crude

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