Leonid Brezhnev was the Soviet Union's leader for 18 years, from 1964 to 1982, at the height of the Cold War.
Leonid Brezhnev was the Soviet Union's leader for 18 years, from 1964 to 1982, at the height of the Cold War. His administration is known for a massive buildup of nuclear weapons, but at a high cost to the Soviet economy.
The Cold War with the United States was at its height when Leonid Brezhnev took control of the Soviet Union in 1964.
Therefore, option 3 explains the statement.
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