One week after toppling the regime of Ugandan leader Milton Obote, Major General Idi Amin declares himself president of Uganda and chief of the armed forces. Amin, head of the Ugandan army and air force since 1966, seized power while Obote was out of the country. Ruling directly, Amin soon revealed himself as an extreme nationalist and tyrant. In 1972, he launched a genocidal program to purge Uganda of its Lango and Acholi ethnic groups. Later that year, he ordered all Asians to leave the country, and some 60,000 Indians and Pakistanis fled, thrusting Uganda into economic collapse. In 1976, he made himself president for life and stepped up his suppression of various ethnic groups and political opponents in the military and elsewhere. In 1978, Amin invaded Tanzania in an attempt to annex the Kagera region and divert attention from Uganda's internal problems. In 1979, Tanzania launched a successful counteroffensive with the assistance of the Uganda National Liberation Front, a coalition of various armed Ugandan exiles. Amin and his government fled the country, and Obote returned from exile to reassume the Ugandan presidency. Amin eventually settled in Saudi Arabia. He was held responsible for the murder of up to 300,000 Ugandans.