After a short period when Béla Kun ruled a Soviet Republic, the Horthy era saw an almost complete break in relations until after World War II.

Hungary became a member of the Warsaw Pact in 1955; since the end of World War II, Soviet troops were stationed in the country, intervening at the time of the Hungarian Revolution of 1956.

A counterrevolutionary White Terror would ensue, and the pre-war ruling clique of aristocrats, civil servants and army officers would be restored.

[4] Miklós Horthy de Nagybánya would be elected Regent after the monarchy was restored — former King Charles IV was unable to retake the throne before he died in 1922.

[6] In November 1940 István Csáky would be warned again, this time by Adolf Hitler, that Stalin was interested in seizing Ruthenia and possibly other areas of Hungary.

[8] For a time Stalin considered Hungary no longer involved in the war against his regime,[9] but Horthy was always under the impression the Third Reich needed more troops which he offered in the winter.

The Red Army regained the pre-war Soviet territory, and advanced westward from its borders to defeat Nazi Germany and its allies, including Hungary.

On November 4, 1956, a large joint military force of the Warsaw Pact, led by Moscow, entered Budapest to crush the armed resistance.

Several hundreds were illegally deported by train to Uzhgorod (Ungvár) in Soviet Ukraine and transported to several prisons in Stryi, Drohobych, Chernivtsi, and Stanislav (Ivano-Frankivsk).

The Soviets had Imre Nagy replaced as Prime Minister of Hungary with János Kádár, the leader of the Hungarian Socialist Workers' Party.

In spite of a written safe conduct of free passage by János Kádár, on 22 November 1956, Nagy was arrested by the Soviet forces as he was leaving the Yugoslav Embassy, and taken to Snagov, Romania.

[23] According to Fedor Burlatsky, a Kremlin insider, Soviet Premier Nikita Khrushchev had Nagy executed, "as a lesson to all other leaders in socialist countries.