The United States says there will be no further compensation paid for the nuclear tests it carried out in the Marshall Islands after World War II.
The US carried out 67 nuclear tests after World War II and some Pacific atolls remain uninhabitable.
The US has already provided nearly $US600 million in compensation and assistance to the Marshall Islands though $US2 billion awarded by a nuclear claims tribunal remains outstanding.
But the US Ambassador to the Marshall Islands, Tom Armbruster, speaking at the Pacific Islands Forum being held there, said full and final compensation had been paid.
"However, we engage with them in a number of areas. The Department of Energy is here fulltime and people that were affected by the 57 tests in the 1950s have access to lifetime health care that the United States provides."
Mr Armbruster says the US is also providing science scholarships for young Marshall Islanders and has de-classified documents the Marshall Islands wanted.
New Zealand Prime Minister John Key, who was also at the forum, says further compensation is a matter to be settled between the two countries.