The treaty was previously a full three-way defence pact, but following a dispute between New Zealand and the United States in 1984 over visiting rights for ships and submarines capable of carrying nuclear arms or nuclear-powered ships of the US Navy to New Zealand ports, the treaty became between Australia and New Zealand and between Australia and the United States, i.e. the treaty has lapsed between the United States and New Zealand, although it remains separately in force between both of those states and Australia. In 2000, the United States opened its ports to the Royal New Zealand Navy once again, and under the presidency of Bill Clinton in the US and the government of Helen Clark in New Zealand, the countries have since reestablished bilateral cooperation on defence and security for world peace.