Final answer:
U.S. Presidents Eisenhower, Nixon, Ford, and Reagan all took part in seeking peaceful relations with the Soviet Union during the Cold War, through diplomacy and treaties like the Helsinki Accords and negotiations with Soviet leaders.
Step-by-step explanation:
The question pertains to various U.S. presidents who sought to establish peaceful relations with the Soviet Union during the Cold War. During the 1950s and 1960s, President Eisenhower sought to ease Cold War tensions, exemplified by the visit of Vice President Richard Nixon to Moscow in 1959. Later, Presidents like Richard Nixon and Gerald Ford continued these efforts, notably with Nixon's establishment of détente and the signing of the Helsinki Accords during Ford's presidency.
Notwithstanding his tough stance on communism, President Reagan also engaged in diplomacy aimed at reducing the nuclear threat through treaties, especially his negotiations with Soviet leader Mikhail Gorbachev. This context of seeking peaceful coexistence and decreasing hostilities through diplomatic means and treaties is a significant thread in the foreign policies of multiple U.S. presidents regarding the Soviet Union.