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The Roosevelt administration
Back-channel negotiations were used to establish diplomatic relations under the Franklin D. Roosevelt presidency in 1933
The Kennedy administration
Robert Kennedy’s role as an intermediary between the White House and the Soviets eventually helped sidestep the two countries’ use of nuclear weapons through a public U.S. pledge not to invade Cuba if the Soviet Union pulled out their missiles along with a private promise to remove U.S. missiles in Italy and Turkey. (anti-nepotism laws were result of this)
The Nixon administration
Over the course of his presidency, Nixon worked to achieve détente – the relaxing of tensions between the U.S. and the Soviet Union – largely through a back-channel diplomatic relationship between Henry Kissinger and Soviet ambassador Anatoly Dobrynin because he was wary of press leaks and distrustful of traditional channels of diplomacy.
The Obama administration
In March 2013, the Obama administration opened up a back channel with Iran, and subsequently held several secret meetings. When the Iran Nuclear deal was brokered, Obama said the back-channel conversations were instrumental in negotiating the deal, according to the Associated Press.
Obama also approved secret negotiations with Iran in 2014 that were used to negotiate for the freedom of Americans held captive there.