During his term, Bush signed various bilateral treaties between the United States and the Soviet Union, like START I and START II, on the limitation of strategic offensive arms and nuclear weapons. With the fall of Berlin Wall in late 1989, the Bush administration facilitated reunification of Germany on terms favorable to the United States and a democratic Germany. During the same time, the United States invaded Panama to depose Panamanian dictator Manuel Noriega. With Soviet regime's position weakening on all fronts, the Soviet Union dissolved in late 1991, thus ending the Cold War. Bush achieved an approval rating of 89% in March 1991, after the United States' and coalition victory in Persian Gulf.