Foreign relations of Australia are influenced by its position as a leading trading nation and as a significant donor of humanitarian aid. Australia's foreign policy is guided by a commitment to multilateralism and regionalism, as well as to strong bilateral relations with its allies. Key concerns include free trade, terrorism, refugees, economic co-operation with Asia and stability in the Asia-Pacific. Australia is active in the United Nations and the Commonwealth of Nations. Given its history of starting and supporting important regional and global initiatives, it has been described as a regional middle power par excellence.
Australia's imports of major weapons increased 65 per cent between 2005–2009 and 2010–14, making it the sixth largest importer in the world according to SIPRI.
It has become steadfastly allied with New Zealand, through long-standing ANZAC ties dating back to the early 1900s, as well as the United States, throughout the Cold War and since. With the rapid growth in trade relations with China, however, Australia has been debating whether to shift its emphasis to Asia. A major debate has been underway with a large numbers of refugees streaming into Australia.
Before the Second World War, the British Government handled most of Australia's foreign policy. The critical decision during the war was to more closely align the military and the diplomacy with the United States. The first accredited diplomat sent to any foreign country was B. G. Casey, appointed in January 1940. Since 1941, United States has been the most important ally and trading partner. Australian concluded an agreement in 1944 with New Zealand dealing with the security, welfare, and advancement of the people of the independent territories of the Pacific (the ANZAC pact). After the war, Australia played a role in the Far Eastern Commission in Japan and supported Indonesian independence during that country's revolt against the Dutch (1945–49).