During the late 1980s, several key events contributed to the end of the Cold War, a period marked by political tension and military rivalry between the United States and the Soviet Union. One pivotal figure in this transformation was Mikhail Gorbachev, whose policies of glasnost (openness) and perestroika (restructuring) aimed to reform the Soviet system. These changes led to increased transparency and a reduction in the authoritarian grip of the Soviet Union, eventually culminating in a series of diplomatic agreements with the United States.
Which of the following was a result of Gorbachev's reforms and other simultaneous events in Eastern Europe during the late 1980s?