What was the name of the treaty signed by Germany, Austria and Russia that ended Russia's participation in World War I?

The Treaty of Brest-Litovsk was a peace treaty signed on 3 March 1918 between the new Bolshevik government of Soviet Russia and the Central Powers (Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire), that ended Russia's participation in World War I. The treaty was signed at Brest-Litovsk (Polish: Brześć Litewski; since 1945 known as Brest), after two months of negotiations. The treaty was agreed upon by the Bolshevik government to stop further advances by German and Austro-Hungarian forces. According to the treaty, Soviet Russia defaulted on all of Imperial Russia's commitments to the Triple Entente alliance.

In the treaty, Bolshevik Russia ceded the Baltic States to Germany; they were meant to become German vassal states under German princelings.

The treaty was effectively terminated in November 1918, when Germany surrendered to the Allies. However, in the meantime, it did provide some relief to the Bolsheviks, already fighting the Russian Civil War, by the renunciation of Russia's claims on modern-day Poland, Finland, Estonia, Latvia, Ukraine and Lithuania.