Answer
The Bolsheviks seized power in Russia under Vladimir Lenen. There was a peace treaty between Russia and Germany. Germany was now able to focus only on the western front.
Step-by-step explanation
The Bolsheviks were a members of the wing of the Russian social democratic workers party which led by Vladimir Lenin, seized control of the government in Russia. They consisted primarily of workers under a democratic internal hierarchy governed by the principle of democratic centralism, who considered themselves the leaders of the revolutionary working class of Russia. To end the war Lenin promised to bring an end to the war, to give land to peasants, to give workers control of factories, to take control of the banks and to give power to soviets (councils) of workers and soldiers set up throughout Russia.