As the international community polarised into opposing alliances led by the respective superpowers, Australia too moved to strengthen its alliance with the United States. Along with the United Kingdom and France, Australia was a main ally of the US in the Asia-Pacific region.China (after 1949), North Vietnam (after 1954) and the USSR were all in one camp. Australians were once again reminded that the initiation of this cold war was similar to that of WWII, thus reinforcing the fear and need for security, from Asia. After the Chinese Communist Revolutionand the North Korean infiltration of South Korea in 1950, Australia's foreign policy was influenced by growing concern over communist aggression. Australia increasingly looked to the US, as its new "great and powerful friend" for help to contain and fight communism. The Menzies government made a great effort of linking Australia to US foreign policy in the Asia-Pacific region. Two major alliance agreements were made between members of the Western Bloc in the 1950s: ANZUS, an agreement for aid in the event of an attack between Australia, New Zealand and the US and SEATO, an agreement guaranteeing defensive action in the event of an attack against the US, Australia, Great Britain, France, New Zealand, Thailand, Pakistan, the Philippines, South Korea, and South Vietnam.