What three European nations fought together in world war 1?

During World War I, the three European nations that fought together as part of the Allied Powers were France, the United Kingdom, and Russia. These countries formed a coalition against the Central Powers, which primarily included Germany, Austria-Hungary, and the Ottoman Empire. Their collaboration was crucial in various battles throughout the war, significantly impacting the overall outcome. However, Russia exited the war in 1917 following the Bolshevik Revolution.