Two Plus Four Agreement (Treaty on the Final Settlement with Respect to Germany)

Two Plus Four Agreement (Treaty on the Final Settlement with Respect to Germany)
Name	Treaty on the Final Settlement with Respect to Germany
Native name	Zwei-plus-Vier-Vertrag
Caption	Flag of the Federal Republic of Germany, 1990
Date signed	12 September 1990
Location signed	Moscow
Date effective	15 March 1991
Parties	Federal Republic of Germany, German Democratic Republic, United States of America, Union of Soviet Socialist Republics, United Kingdom, French Republic

Two Plus Four Agreement (Treaty on the Final Settlement with Respect to Germany) was the multinational instrument that settled the external aspects of German reunification and ended World War II occupation-era constraints on German sovereignty. Negotiated between the two German states and the four wartime Allied powers, it addressed borders, military limitations, and international status, enabling the Unification of Germany on 3 October 1990. The treaty formed a legal and diplomatic bridge linking the collapse of the Soviet Union and the expansion of European integration.

Background

In the late 1980s the political shifts of Perestroika and Glasnost under Mikhail Gorbachev and the mass mobilizations epitomized by the Peaceful Revolution accelerated discussions about the future of East Germany and West Germany. The Fall of the Berlin Wall in November 1989 intensified diplomatic activity among the United States of America, Union of Soviet Socialist Republics, United Kingdom, and French Republic—the Four Powers that signed the Potsdam Agreement and occupied Germany after World War II. Simultaneously, leaders including Helmut Kohl, Hans-Dietrich Genscher, Lothar de Maizière, George H. W. Bush, François Mitterrand, Margaret Thatcher, and Soviet officials debated security arrangements, NATO membership, and the status of Berlin.

Negotiation and Signing

Negotiations combined German internal unification talks led by the Treaty on German Reunification process with Four Power diplomacy that culminated in summit-level diplomacy in Moscow. The "Two Plus Four" format brought together the two German states—Federal Republic of Germany and German Democratic Republic—and the four occupying powers to remove external obstacles to reunification. Key moments included meetings at Bonn, Paris, Moscow and bilateral exchanges between representatives of Helmut Kohl and counterparts such as James Baker and Eduard Shevardnadze. The treaty text was signed on 12 September 1990 in Moscow and ratified according to procedures of the signatory states, coming into force on 15 March 1991.

Key Provisions

The treaty contained provisions that clarified sovereignty, borders, and military constraints. It confirmed the existing border between Germany and Poland, recognizing the Oder–Neisse line as final and dispelling territorial claims related to the Territorial changes of Germany after World War II. The agreement reaffirmed German unity within the boundaries established by the Potsdam Agreement and removed occupation rights held by the United States, Union of Soviet Socialist Republics, United Kingdom, and French Republic. It established limitations on German armed forces, including restrictions on the possession of nuclear, biological, and chemical weapons, and committed a unified Germany to remain a non-nuclear weapons state with respect to its own territory. The treaty also addressed NATO membership, permitting unified Germany to join North Atlantic Treaty Organization while stipulating that foreign nuclear weapons would not be stationed on former German Democratic Republic territory.

Implementation and Withdrawal of Foreign Troops

Implementation required coordinated military and diplomatic steps by the Four Powers and the new German state. The Soviet Union agreed to withdraw its forces from former German Democratic Republic territory; this withdrawal was executed between 1990 and 1994 and completed amid budgetary and logistical challenges that involved the Russian Federation as successor state. Meanwhile, United States and British Armed Forces adjusted deployments in Western Europe in accordance with NATO planning, and the French Armed Forces recalibrated bilateral arrangements. The treaty set timelines and mechanisms for the withdrawal, cantonment, and repatriation of forces, and for the transfer of facilities and responsibilities to the German authorities.

Impact on German Reunification

The agreement removed the principal external impediments to the political and territorial reunification process led by the Treaty on the Final Settlement with Respect to Germany signatories and the internal accession of the German Democratic Republic to the Federal Republic of Germany. By securing the consent of the Four Powers and addressing security concerns of neighboring states such as Poland and Czechoslovakia (then represented in various discussions), it enabled Helmut Kohl's government and the All-German People's Congress to proceed with constitutional and administrative integration. The treaty thus facilitated membership continuity for a united Germany in institutions like European Community and provided a foundation for later foreign and defense policies.

Legal Status and International Recognition

Legally, the treaty is an international agreement signed by sovereign entities that extinguished residual post‑war occupation rights and restored full sovereignty to a reunified Germany. Ratified by the parliaments of the signatories, it interacts with German constitutional law—particularly the Grundgesetz—and with bilateral treaties such as the Treaty on the Final Settlement with Respect to Germany-related instruments concerning borders and minority protections. Internationally, the treaty was recognized by the United Nations membership and acknowledged in subsequent security architectures, including NATO enlargement debates and Organization for Security and Co-operation in Europe diplomacy.

Legacy and Historical Assessment

Historians and diplomats view the Two Plus Four Agreement as a landmark that closed the chapter on the post‑1945 order in Central Europe and reshaped the Cold War settlement. It is credited with enabling peaceful reunification, addressing Polish territorial anxieties via the Treaty of Warsaw precedents, and setting precedents for state succession exemplified later by the Breakup of the Soviet Union. Debates persist about NATO's eastward enlargement, the pace of European Union integration, and the socio-economic challenges of reunification for regions such as the former German Democratic Republic. The treaty remains central in scholarship on international law, diplomatic history, and post‑Cold War security studies.

Category:1990 treaties Category:German reunification