The Red Army eventually advanced deep into Ukraine and Belarus, and the embattled Ukrainian People's Republic sought military help from Poland to repel the invasion. The joint Polish-Ukrainian armies initially successfully captured the Ukrainian capital, Kyiv, but eventually had to retreat following a massive counteroffensive by the Red Army, culminating in the Polish–Soviet War of 1920. Following the Polish victory upon the Battle of Warsaw, the Soviets sued for peace and the war ended with an armistice in October 1920.
The Red Army eventually advanced deep into Ukraine and Belarus, and the Ukrainian People's Republic sought military help from Poland to repel the invasion. The combined Polish-Ukrainian forces initially captured Kyiv but were forced to retreat after a massive counterattack by the Red Army in 1920, which culminated in the Polish–Soviet War. Following the Polish victory at Warsaw, peace was negotiated and an armistice was signed in October 1920.