Technically this waste became the problem of the Marshall Islands when they became independent in 1979. That was the time to negotiate with the US about the remaining waste. This is similar to how Chernobyl is a Ukrainian issue.

That said, the islanders still have a lot of options. As a free and independent nation, they own the waste with all it's problems BUT also with all it's advantages.

Call the Iranians, the North Koreans, the Indians, the Pakistanis and anyone else with cash and ambition (ISIS, the Saudis?). Tell them you have 30 olympic sized pools worth of plutonium-containing waste and you're holding an auction for it on April 1st next year. More than enough for 1000 dirty bombs or maybe even a few high yield A-bombs if they can be bothered to refine it.

Then watch the western world beat a path to your door to talk about how much they want to take the same material for "safe keeping" and how the "global community" is "excited to help".

What was it Churchill said: "You can rely on the US (the western world) to do the right thing; once they have exhausted every other option".