U.S. officials have confiscated North Korea’s second-largest cargo vessel in a crackdown on the smuggling operations that finance the regime’s nuclear weapons program, the Justice Department announced Thursday.

“This sanctions-busting ship is now out of service,” John Demers, the assistant attorney general for national security, told reporters Thursday afternoon. “Forfeiting the ship will deprive the North Korean regime of a significant means by which it has evaded sanctions and funded itself.”