Original sentence: Border skirmishes then escalated into open warfare following Piłsudski's attempt to take advantage of Russia's weakness with a major incursion into Ukraine in early 1920 (the Kiev Operation).Meanwhile western fears of Soviet troops arriving at the German frontiers increased Allied interest in the war
Edited sentence: Border skirmishes then escalated into open warfare when Piłsudski responded to Russia's aggression with a major incursion into Ukraine in early 1920 (the Kiev Operation).The intention of the Soviets was to invade Germany and unleash a Communist uprising throughout Europe.Western fears of Soviet troops arriving at the German frontiers increased Allied interest in the war