The Marshall Islands is on an unlikely mission — trying to press India, Pakistan and the United Kingdom to curb their nuclear programs.

The Pacific archipelago, which was the site of dozens of U.S. nuclear tests in the '40s and '50s, is suing the three countries in the U.N.'s International Court of Justice. The Marshall Islands says the three countries haven't carried out in good faith their obligations to pursue negotiations leading to nuclear disarmament.

It says the U.K. is obligated to do so because it is a signatory to the Nuclear Non-Proliferation Treaty. India and Pakistan haven't signed the NPT, but the Marshall Islands argues that this principle is sufficiently well-enshrined in international law to be considered customary law.

"Nobody expects the Marshall Islands to force the three powers to disarm, but the archipelago's dogged campaign highlights the growing scope for political minnows to get a hearing through global tribunals," Reuters reports.

So why isn't the Marshall Islands suing the U.S., the country that was actually testing its nukes on their territory? The short answer: It tried. As the Two-Way reported when the case was filed in 2014, the island chain attempted to file suit against all nine countries believed to possess a nuclear arsenal:

"Besides the U.S., the Marshall Islands is also suing Russia, China, France and the U.K., which have all signed the Non-Proliferation Treaty, or NPT, as well as four other countries that have never signed — India, Pakistan, North Korea and Israel, which has never acknowledged possessing nuclear weapons. ..."In court documents, the Marshall Islands argues that the 1958 NPT, which did not come into force until 1970, amounts to a compact between nuclear haves and have-nots. Non-weapons states essentially agreed not to try to acquire nuclear weapons in exchange for weapons states moving toward disarmament, the Marshalls says."

However, only the cases against India, Pakistan and the U.K. are still proceeding. That's because these are the only three countries that have "made a commitment to respond to suits brought at the ICJ," Reuters reports. Preliminary hearings against India started on Monday in The Hague, with sessions on Pakistan and the U.K. scheduled in the coming weeks.

The Marshall Islands is pursuing global disarmament as a result of its "particular awareness of the dire consequences of nuclear weapons," according to court documents.

In 2014, the Two-Way reported on the lasting impact of those tests:

"Although islanders were relocated from Bikini and Eniwetok atolls — ground zero for the majority of the tests — three other Marshall atolls underwent emergency evacuations in 1954 after they were unexpectedly exposed to radioactive fallout. The Marshallese say they've suffered serious health issues ever since."The Marshall Islands were governed by the U.S. until 1979 and won full independence in 1986."

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