What treaty was signed between Russia and Germany to end Russia's

participation in the war?

The Treaty of Brest-Litovsk (also known as the Brest Peace in Russia)

Explanation:

The Treaty of Brest-Litovsk (also known as the Brest Peace in Russia) was a peace treaty signed on March 3, 1918 between the new Bolshevik government of Russia and the Central Powers (German Empire, Austria-Hungary, Bulgaria, and the Ottoman Empire), that ended Russia's participation in World War I.