u/NextDocument1906

On 21 May 1945, negotiations were held in the village of Ruda Różaniecka between representatives of the Ukrainian Insurgent Army (UPA) and former members of the Polish Home Army (Armia Krajowa, AK). The talks resulted in a number of agreements on joint operations against Soviet forces.

According to the Polish historian Grzegorz Motyka, the partial shift in the policy of the Ukrainian nationalist movement toward the Polish population occurred because, by that time, the Poles had already largely left the Eastern Borderlands (Kresy).

Some context:

The First Conference of the Oppressed Peoples of Eastern Europe and Asia (21–22 November 1943) was a meeting of members of the Ukrainian Insurgent Army (UPA) representing various peoples of the Soviet Union. It was organized at the initiative of the leadership of the UPA and the Organization of Ukrainian Nationalists (OUN) with the aim of fostering nationalist movements within the USSR and coordinating their efforts in the struggle against what they described as their "common enemy"—"Russian communism."

In 1943, the leadership of the UPA–OUN developed the idea of uniting with other nationalist movements across the Soviet Union in a common struggle against this perceived enemy.

In June 1943, the UPA command appealed to representatives of the peoples of Turkestan, the Urals, the Volga region, and Siberia, urging them to establish contact with the UPA, defect to its side with their weapons, and join a "common struggle against the imperialist predators"—Moscow and Berlin—which, according to the appeal, were "arguing over which of them should exploit you."

According to the UPA leadership, the moment was opportune because the warring powers had become greatly weakened, and "the period of national revolutions has arrived," a time that "the peoples of Europe and Asia must use to expel the imperialists from their lands and restore independent nation-states."