I think that it was Nixon in the 1970's. Why not look in Wikipedia?
Richard Nixon
decrease in tension during the cold war1: the relaxation of strained relations or tensions (as between nations); also : a policy promoting this2: a period of détente
The president of the Soviet Union as Russia was then known in the year 1969 was Mr Breshnev.
ended with the Soviet invasion of Afghanistan.
Before Boris Yeltsin, the President of the Russian Soviet Federative Socialist Republic was Mikhail Gorbachev. Gorbachev served as the leader of the Soviet Union from 1985 until its dissolution in 1991, implementing significant reforms like glasnost and perestroika. Yeltsin became the first President of the Russian Federation after winning the election in June 1991, following the period of Gorbachev's leadership.
Ronald Reagan .
it ended with the Soviet Union invading Afghanistan in 1979.
If a US president is going to be put under anesthetic for a period of time, the position is transferred to the vice president for that period. The vice president becomes the acting president.
Mikhail Gorbachev
The US and the Soviet Union engaged in arm negotiations during a period of relaxed tension also known as detente.
For what period does the vise president of India hold hold office?
The cold war