sentences:  Kiev fell to the Reds in February 1919 and had pushed the UNR's forces against Polish ones moving into Volhynia.This cut the UNR's armies in two.By May 1919, the UNR occupied a small strip of land around Brody and at the same time were negotiating with the Poles, with an armistice with the Poles, the Ukrainians could push forwards and they attacked south-eastwards to Kamanets Podil'skyi.