The Pentagon conducted its 21st strike on an alleged drug-trafficking vessel in the Eastern Pacific, killing three men, according to U.S. Southern Command.

The U.S. military says the strikes target narcotics smuggling along known trafficking routes using fighter jets, drones, and gunships.

This brings the total reported deaths from the campaign to 83, with officials claiming congressional approval is not required for the operations.

Legal and diplomatic concerns have arisen, with experts questioning whether the strikes violate U.S. or international law, CNN has reported.

Colombia and the United Kingdom have suspended intelligence sharing with the U.S. in response, citing objections to the ongoing attacks.