Warsaw Pact Timeline

(1955–1991)

The Warsaw Pact was a Soviet-led military alliance formed in 1955 by the USSR and several Eastern European states as a counterbalance to NATO during the Cold War. More Less

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Origins and formation

Stalin Note reunification talks end

20 Mar 1952

Talks initiated by the Stalin Note about German reunification ended after the United Kingdom, France, and the United States insisted that a unified Germany should be neutral only in the context of freedom to join the European Defence Community and rearm.

Image source: Stalin Note

Soviet Union proposes joining NATO

1954

Fearing the restoration of German militarism in West Germany, the Soviet Union suggested that it join NATO. The United States rejected the proposal, which reflected the growing confrontation between the Soviet bloc and the Western alliance.

Image source: 2021 Russian ultimatum to NATO

Hastings Ismay opposes Soviet NATO request

1954

British General Hastings Ismay opposed the Soviet request to join NATO in 1954, comparing it to “an unrepentant burglar requesting to join the police force.”

Berlin Conference concludes

Feb 1954

The Berlin Conference of January–February 1954 preceded the Soviet Union’s proposal to join NATO. The request arose amid disputes over German reunification, West German rearmament, and the future security structure of Europe.

Adenauer visits the United States

Apr 1954

In April 1954, West German Chancellor Konrad Adenauer made his first visit to the United States, meeting Richard Nixon, Dwight Eisenhower, and John Foster Dulles during negotiations over West Germany’s place in Western security arrangements.

French Parliament rejects the EDC

30 Aug 1954

The French Parliament rejected the European Defence Community, ensuring its failure and blocking a major United States objective: associating West Germany militarily with the Western European states.

Image source: Treaty establishing the European Defence Community

West German NATO admission decided

23 Oct 1954

On 23 October 1954, the admission of the Federal Republic of Germany to the North Atlantic Pact was finally decided, intensifying Soviet fears about a remilitarized West Germany.

Image source: Germany–United States relations

USSR proposes a European Security Treaty

Nov 1954

The Soviet Union proposed a new European Security Treaty in November 1954 as a final attempt to prevent a remilitarized West Germany from becoming aligned against the Soviet Union. The proposal was unsuccessful.

Image source: European Security Treaty

Warsaw Pact is considered superfluous

1955

Because the Soviet Union already maintained armed forces and political domination throughout its Eastern European satellite states, the Warsaw Pact was long considered superfluous. NATO officials reportedly characterized the hurriedly conceived alliance as a “cardboard castle.”

Image source: Warsaw Pact

West Germany joins NATO

9 May 1955

The incorporation of West Germany into NATO on 9 May 1955 was described by Norwegian Foreign Affairs Minister Halvard Lange as a decisive turning point in European history.

Warsaw Pact is established

14 May 1955

The Soviet Union and seven other Eastern European countries established the Treaty of Friendship, Cooperation and Mutual Assistance, commonly called the Warsaw Pact, in Warsaw, Poland. The alliance was presented as a response to West Germany’s integration into NATO and as a system of collective security.

Military policy and interventions

Khrushchev reduces Soviet Ground Forces

1956

After 1956, Soviet leader Nikita Khrushchev reduced the Ground Forces while building up the Strategic Rocket Forces. The policy emphasized nuclear capabilities within Soviet and Warsaw Pact military planning.

Image source: Nikita Khrushchev

Hungary attempts to withdraw from the Pact

1956

The government of Imre Nagy declared Hungary’s withdrawal from the Warsaw Pact. Soviet troops then entered the country and removed the government, preventing Hungary from leaving the Soviet-led alliance.

Image source: Hungarian Revolution of 1956

Soviet forces invade Hungary

Nov 1956

Soviet forces invaded Hungary, a Warsaw Pact member, and violently suppressed the Hungarian Revolution. The intervention demonstrated that the alliance could be used to preserve Soviet political control within its member states.

Zhukov is removed from the Politburo

1957

Marshal Georgy Zhukov was removed from the Soviet Politburo in 1957 after opposing Khrushchev’s reductions in the Ground Forces.

Image source: Georgy Zhukov

Warsaw Pact rehearses nuclear invasion scenarios

1964 - 1979

Soviet and Warsaw Pact forces repeatedly rehearsed the large-scale use of nuclear weapons in invasion exercises. Scenarios included a 1964 Czech plan involving the seizure of Lyon by the ninth day and Poland’s 1979 Seven Days to the River Rhine exercise.

Warsaw Pact invades Czechoslovakia

Aug 1968

Warsaw Pact forces invaded Czechoslovakia, one of the alliance’s own member states, in August 1968. The operation suppressed the Prague Spring and was the multinational Communist armed forces’ sole joint military action.

Image source: Warsaw Pact invasion of Czechoslovakia

Member-state relations

Soviet-Polish treaty ensures troop deployment

17 Dec 1956

The Soviet Union concluded a bilateral 20-year treaty with Poland on 17 December 1956. The agreement helped ensure that Soviet troops could remain deployed in Poland.

Image source: Poland–Russia relations

Soviet-East German treaty ensures troop deployment

12 Mar 1957

A bilateral 20-year treaty between the Soviet Union and the German Democratic Republic was signed on 12 March 1957, supporting the continued deployment of Soviet troops in East Germany.

Image source: East Germany–Soviet Union relations

Soviet-Romanian treaty is signed

15 Apr 1957

The Soviet Union and Romania signed a bilateral 20-year treaty on 15 April 1957. Soviet forces were later removed as part of Romania’s de-satellization and increasingly autonomous foreign policy.

Image source: Romania–Russia relations

Soviet-Hungarian treaty is signed

27 May 1957

The Soviet Union and Hungary signed a bilateral 20-year treaty on 27 May 1957, helping ensure the continued presence of Soviet troops in Hungary after the suppression of the 1956 revolution.

Image source: Hungary–Soviet Union relations

Romania requests Soviet troop withdrawal

1958

Romania requested and obtained the complete withdrawal of the Soviet Army from its territory in 1958, an important step in the country’s development of greater autonomy within the Warsaw Pact.

Image source: Soviet occupation of Romania

China ends Warsaw Pact observer status

1961

China terminated its observer status in 1961 as a consequence of the Albanian-Soviet split. China backed Albania against the Soviet Union during the broader Sino-Soviet split.

Image source: Sino-Soviet split

Soviet troops leave Romania

1963

Soviet troops were deployed to Romania for the last time in 1963 as part of a Warsaw Pact exercise. After 1964, the Soviet Army was barred from returning because Romania refused to participate in joint Pact exercises.

Romania blocks Mongolian accession

Jul 1963

Romania blocked Mongolia’s accession to the Warsaw Pact in July 1963, illustrating Bucharest’s increasingly independent position within the Soviet-led alliance.

Mongolia requests Warsaw Pact membership

Jul 1963

The Mongolian People’s Republic asked to join the Warsaw Pact under Article 9 of the treaty in July 1963. The request did not result in full membership.

Image source: Warsaw Pact

Romania issues its declaration of independence

22 Apr 1964

The Romanian Communist Party issued a declaration proclaiming the sovereign right of every Marxist–Leninist party to choose its own methods of socialist construction. The statement rejected superior and subordinate communist parties and opposed a single model for socialism.

Image source: 1957 International Meeting of Communist and Workers Parties

Romania withdraws Soviet advisers

Dec 1964

Romania became the only Warsaw Pact member other than Albania to withdraw all Soviet advisers, including those serving in intelligence and security institutions.

Soviet troops are stationed in Mongolia

1966

The Soviet government agreed to station troops in Mongolia in 1966, extending Soviet military presence in East Asia even though Mongolia’s request to join the Warsaw Pact had not produced membership.

Image source: Mongolia–Russia relations

Albania leaves the Warsaw Pact

1968

Albania officially left the Warsaw Pact in 1968 in protest against the invasion of Czechoslovakia, becoming an exception to the alliance’s continued membership structure.

Dissolution and legacy

Warsaw Pact leaders renew the alliance

Apr 1985

Leaders of the Warsaw Pact members met in Warsaw in April 1985 and renewed the alliance for thirty years. The renewal would formally have extended the treaty until May 2015, although political changes soon made it irrelevant.

Communist governments are overthrown

1989 - 1991

From 1989 to 1991, Communist governments were overthrown in Poland, Hungary, Czechoslovakia, East Germany, Romania, Bulgaria, and the Soviet Union. The collapse of these governments destroyed the political structure supporting the Warsaw Pact.

Image source: Revolutions of 1989

Solidarity wins Poland’s elections

Jun 1989

The Solidarity movement achieved electoral success in Poland in June 1989. Its victory formed part of the wider revolutionary wave that began to unravel the Warsaw Pact’s political foundation.

Image source: 1989 Polish parliamentary election

Pan-European Picnic accelerates the Pact’s collapse

Aug 1989

The Pan-European Picnic in August 1989 became a symbolic beginning of the end of the Warsaw Pact. It helped expose the weakening of Communist control and contributed to the spread of the Revolutions of 1989.

Image source: Pan-European Picnic

East Germany withdraws from the Pact

1990

East Germany withdrew from the Warsaw Pact following German reunification in 1990, removing one of the alliance’s most strategically important members.

Image source: German reunification

Warsaw Pact is declared disbanded

25 Feb 1991

At a meeting in Hungary, the defence and foreign ministers of the six remaining member states jointly declared the Warsaw Pact disbanded on 25 February 1991.

Czechoslovakia formally ends the Warsaw Treaty

1 Jul 1991

In Prague on 1 July 1991, Czechoslovak President Václav Havel formally ended the 1955 Treaty of Friendship, Cooperation and Mutual Assistance, disestablishing the Warsaw Treaty after 36 years.

Soviet Union is dissolved

Dec 1991

The Soviet Union disestablished itself in December 1991. Its dissolution finalized the collapse of the state that had created and dominated the Warsaw Pact, while many former Soviet republics soon pursued new security arrangements.

Image source: Dissolution of the Soviet Union

Collective Security Treaty is signed

1992

Russia and several other post-Soviet states joined the Collective Security Treaty in 1992, later forming the Collective Security Treaty Organization as a successor security framework for some former Soviet republics.

Image source: Collective Security Treaty Organization

Shanghai Five is established

1996

Russia and some other post-Soviet states joined the Shanghai Five in 1996. The organization was renamed the Shanghai Cooperation Organisation after Uzbekistan joined in 2001.

Image source: Shanghai Cooperation Organisation

Former Pact members join NATO

12 Mar 1999 - 1 Apr 2009

The Czech Republic, Hungary, and Poland joined NATO on 12 March 1999. Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovenia, and Slovakia joined in March 2004, followed by Croatia and Albania on 1 April 2009.

Image source: Enlargement of NATO

Warsaw Treaty archives are opened

Nov 2005

In November 2005, the Polish government opened Warsaw Treaty archives to the Institute of National Remembrance. The institute published about 1,300 declassified documents in January 2006, while 100 documents remained pending military declassification.

Image source: Institute of National Remembrance