Venezuela is going after Argentina’s president, Javier Milei, accusing him of illegally giving a Venezuelan cargo plane to the United States. This move has sparked a tense dispute between the two South American countries, centered on a Boeing 747 cargo plane that was originally purchased from Iran.

Here’s what happened: in August 2022, Argentina seized the Venezuelan plane after the U.S. requested it. The U.S. had blacklisted the plane’s previous owner, Iran’s Mahan Air, as part of sanct...