In 1919 with the end of the Polish–Ukrainian War, the Second Polish Republic took over most of the territory claimed by the West Ukrainian National Republic (the rest was absorbed by the Soviet Union). One year later, exiled Ukrainian officers set up the Ukrainian Military Organization (Ukrainian - Українська Військова Організація: Ukrayins'ka Viys'kova Orhanizatsiya, the UVO), an underground military organization composed of Ukrainian veterans with the goals of continuing the armed struggle against Poland, of destabilizing the political situation, and of preparing disarmed veterans for an anti-Polish uprising. The UVO was strictly a military organization with a military command-structure.