René Jean Pleven was a notable French politician of the Fourth Republic. A member of the Free French, he helped found the Democratic and Socialist Union of the Resistance (UDSR), a political party that was meant to be a successor to the wartime Resistance movement. He served as prime minister twice in the early 1950s, where his most notable contribution was the introduction of the Pleven Plan, which called for a European Defence Community between France, Italy, West Germany, and the Benelux countries.

The Treaty establishing the European Defence Community, also known as the Treaty of Paris, is an unratified treaty signed on 27 May 1952 by the six 'inner' countries of European integration: the Benelux countries, France, Italy, and West Germany. The treaty would have created a European Defence Community (EDC), with a unified defence force acting as an autonomous European pillar within the North Atlantic Treaty Organization (NATO). The ratification process was completed in the Benelux countries and West Germany, but stranded after the treaty was rejected in the French National Assembly. Instead, the London and Paris Conferences provided for West Germany's accession to NATO and the Western European Union (WEU), the latter of which was a transformed version of the pre-existing Western Union. The historian Odd Arne Westad calls the plan "far too complex to work in practice".