What effect did the eastern front have on world war I

Both of these answers are correct.

Explanation:

The heavy Russian losses, combined with food and fuel shortages, led to the abdication of Czar Nicholas II.

The eastern front weakened Austro-Hungarian forces, making them less effective on the western front.

The Impact of the Eastern Front↑

Explanation:

This unopposed advance was the last action of World War I, the Great War, on the Eastern Front. On 3 March 1918, the Bolshevik government signed the Treaty of Brest-Litovsk, ceding control of Ukraine, Galicia, Finland, the Baltic States, and the Caucasus.