US Vice President Kamala Harris told a South Pacific leaders' summit in Suva in July that the United States would open new embassies in Tonga and Kiribati. She also flagged a tripling of US funding for fisheries assistance to $US60 million ($102m).
Australia's new government, elected in May, is also taking steps to increase its engagement with its island neighbours.
It plans to establish an Australia-Pacific Defence School to train neighbouring armies in response to China's potential military presence in the Solomon Islands.
Australians were reminded of when World War II came to their shores after drivers found what appeared to be an unexploded bomb off the coast of the northern city of Darwin.
Darwin became the first target of Japanese bombers on the Australian mainland in a devastating air raid on 19 February 1942.
A 250-metre exclusion zone has been established in Darwin Harbor until the Defence Department removes the suspected bomb, the Australian Broadcasting Corp reported.