On 19 January 1960, the unequal status of Japan with the United States was corrected with the amended Treaty of Mutual Cooperation and Security between the United States and Japan by adding mutual defense obligations. This treaty requires the US to pre-inform Japan of US army mobilization and to not impose itself concerning Japanese domestic issues. Japan and the United States are obligated to assist each other if there's an armed attack in territories administered by Japan. Japan and the United States are required to maintain capacities to resist common armed attacks. This established a security alliance between Japan and the United States. This treaty doesn't obligate Japan to defend the United States.