Entente

The Triple Entente described the diplomatic understanding between the Russian Empire, French Third Republic and Great Britain which existed prior to the Great War. It was a diplomatic counter to the Triple Alliance between Germany, Austria-Hungary, and Italy. France undertook the key role of creating alliances with Russia and Britain. France also formed the Franco-Japanese treaty, bringing Japan into the sphere of the Entente.

Unlike the Triple Alliance, the Entente was technically not an alliance or a mutual defense pact. It was an informal diplomatic relationship based on mutual self-interest. When the Great War began, however, the Entente coalition rebranded itself as the Allied Powers and agreed that no member of the Allied coalition would agree to a separate peace apart from the other members.

Over the course of the war, the Entente would expand to include nations such as Italy, Romania, and China. The Allied Powers often recruited these new members with promises of territorial concessions once the Central Powers were defeated.

Post Great War
Russia was the first to be knocked out of the Entente by the Communist revolution and the Russian Civil War. Great Britain and France continued to support the White Army, both diplomatically and materially, but the Russians were essentially out of the game on the international scale. Italy, Romania, China, and Japan all broke with the Entente following the Treaty of Brussels. The treaty provisions alienated most of the minor partners as they didn't receive many of the territorial concessions they had been promised. In addition Italy and Japan were offended at being treated like junior partners when they were vying for great power status and wanted to be seen as equals on the international stage.

Relations between United Kingdom and the United States also soured following the war. Among the Commonwealth nations and in England itself, resentment towards the Americans was common. Many in England and the Commonwealth nations felt that they American refusal to join the Great War had cost them victory, and prolonged the war. The Entente collapsed completely with the Syndicalist takeover of France and the formation of the Comintern.