What forced russia to discontinue fighting in world war i?

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It was poorly supplied, trained and led.
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It was no match for the modern German army and it suffered great losses.
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This led to widespread unrest in the ranks of the soldiers.
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Soldiers deserted by the thousands.
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Soldiers shot their own officers.
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Soldiers formed committees within their own units to decide what they would do on the battlefield rather than just take orders.
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The common soldier welcomed the Bolshevik revolution since it put Vladimir Lenin in position to end the war.
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They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.