WASHINGTON (AP) — The United States and Russia are marking the end of a 20-year program to convert highly enriched uranium from dismantled Russian nuclear weapons into fuel for U.S. power plants.

The final shipment arrived in Baltimore this week. The shipment was loaded last month from St. Petersburg, Russia. It was the last one under a program known as Megatons to Megawatts. Energy Secretary Ernest Moniz called the program one of the most successful nuclear nonproliferation partnerships ever undertaken.