World War I: An armistice between Russia and the Central Powers is signed.
On 15 December [O.S. 2 December] 1917, an armistice was signed between the Russian Soviet Federative Socialist Republic on the one side and the Austro-Hungarian Empire, the Kingdom of Bulgaria, the German Empire and the Ottoman Empire—the Central Powers—on the other. The armistice took effect two days later, on 17 December [O.S. 4 December]. By this agreement Russia de facto exited World War I, although fighting would briefly resume before the Treaty of Brest-Litovsk was signed on 3 March 1918, and Russia made peace.