u/AnkleProne

"One of the strangest developments in the Russia situation ... of a treaty of alliance for offensive purposes between Poland and the Ukraine and the initiation of a vigorous joint campaign to drive the Bolsheviki out of Little Russia. For Poland and the Ukraine had long been enemies and engaged in bitter warfare in East Galicia and along the line leading down to the boarders of Western Ukraine, whose right to independence the peasant leader, Petlura, had supported for many months against the forces of Denikin, the Soviet Republic and Poland herself.

Petlura, faced with the occupation of most of the Ukraine ... had fled to Poland, and it was there that this Polish-Ukrainian compact was signed"

- The New York Times Current History, June 1920

Denmark had waived the right to a plebiscite in the zone further south, due to the obviously German majority there