After three years of a join leadership, [[Nikita Khrushchev]] seized power, denounced Stalin's use of terror and effectively reduced repressive controls over party and society. Khrushchev's reforms in agriculture and administration, however, were generally unproductive, and foreign policy toward China and the United States suffered reverses. Khrushchev's colleagues in the leadership removed him from power in 1964.
===Brezhnev ===
Following the ouster of Khrushchev, another period of rule by collective leadership ensued, which lasted until [[Leonid I. Brezhnev ]] established himself in the early 1970s as the preeminent figure in Soviet political life. Brezhnev presided over a period of détente with the West while at the same time building up Soviet military strength; the arms buildup contributed to the demise of [[détente]] in the late 1970s. Also contributing to the end of détente was the [[Soviet-Afghan War|Soviet invasion of Afghanistan]] in December 1979.
After some experimentation with economic reforms in the mid-1960s, the Soviet leadership reverted to established means of economic management. Industry showed slow but steady gains during the 1970s, while agricultural development continued to lag. In contrast to the revolutionary spirit that accompanied the birth of the Soviet Union, the prevailing mood of the Soviet leadership at the time of Brezhnev's death in 1982 was one of cautious conservatism and aversion to change. Brezhnev was succeeded by former KGB head Yuri Andropov.
===Reagan challenge===
Friction with the west continued in the 1980's, especially with the United States and its new president, [[Ronald Reagan]], who saw the Soviet Union for what it was and branded it an "evil empire," partially in response to the Afghanistan occupation. Reagan negotiated with West Germany to provide sites for the basing of Pershing II medium-range ballistic missiles, which was bitterly opposed by Moscow. A short period of confrontation existed between the two superpowers during the period of late-1983 through 1984, beginning with the tragic Soviet attack on a commercial airliner, [[Korean Airlines Flight 007]], over international waters near Sakhalin Island on September 1, 1983, and killing 269 civilians, including a sitting U.S. Congressman, [[Larry McDonald]]; this was followed by events within a military exercise known as [[Able Archer]], in which a falling satellite was mistaken for an incoming ICBM and almost triggered a major war. Reagan's [[Strategic Defense Initiative]], a space-based missile defense system critics derisively dubbed "Star Wars" as well as his expansion of the United States military, also prompted a new, expensive arms race.