The correct answer is: Germany and Russia signed a truce.
The fall of the Tsar occurred in the revolution of February 1917 and was given by the new policies of the Tsar as well as by the entry of Russia to the First World War. Later, the October revolution, also known as the Bolshevik revolution, resulted in the beginning of the government of Lenin, who began to negotiate to get Russia out of the First World War. Finally, thanks to the Treaty of Brest-Litovsk, the truce was agreed.
