The U.S.A. became an enemy of the Soviet Union after the October revolution of 1917. It sent 2000 troops to fight for the anti-Bolshevik Army during the Russian Civil war. The U.S.A. was not willing to give diplomatic recognition to the Soviet Union until President Roosevelt took office and sought to establish diplomatic relations in 1933.
During World War II a reconciliation to comrades-in-arms status against the Nazi Reich was feasible. The U.S.A. supplied the Soviet Union with weapons and war material to fight against German Nazi invaders. That pragmatic working relationship ended with the conclusion of the war as the communists under Stalin resumed their war upon capitalism, democracy and so forth.
The Soviet Union understandably occupied the countries in which they had fought Nazis after the war and forced their totalitarian communism upon the people of those countries. The loss of so many western nations to communism through force created a lasting belligerent status east-west. With captured Nazi scientists and native Russian genius the Soviets built a large nuclear weapons capability that they pointed toward Europe, the United States and other anti-communist nations.
Soviets provided material support for the Communist North Korean parties leading up to the Korean War. After the U.N. chose to hold democratic elections for a government in the South the communists attacked South Korea.
Until the death of the dictator Joseph Stalin March 5, 1953, the Soviets of Russia kept a Communism in one country policy and did not implement Trotsky’s policy of global conquest. With Stalin’s death Soviet expansionism and support for communist revolutions globally resumed with a vengeance. A large number of revolutionary and sometimes anti-colonial wars commenced around the Earth. The United States and N.A.T.O. were the primary opponents to a planet of totalitarian communism. Notably Fidel Castro and Nikita Khrushchev tried to install nuclear missiles pointed at the U.S.A. in Cuba nearly causing nuclear conflict.
The issues that had divided the west and Russia ended with the end of the Soviet Union, or should have, during the Gorbachev-Reagan era (Soviets withdrew a quarter million troops from East Germany in December 1988 starting a political cascade leading to the termination of the Soviet State).
Continuing good relations with Russia is the most important political challenge for the United States today; equal to that of illegal immigration. To rebuild conflict with Russia comparable to the Cold War with the Soviet Union is counterproductive and harmful to U.S. national economic and security interests. Leadership that does so is unAmerican and/or daft.