 Complete the following phrase:  Government Delegate Jan Stanisław Jankowski, chairman of the Council of National Unity Kazimierz Pużak and thirteen other Polish Underground State leaders were invited to and on 27 March 1945 attended talks with General Ivan Serov of the NKVD. They were all arrested and taken to Moscow to await a trial. The Polish communist Provisional Government and the Western leaders were not informed by the Soviets of the arrests. The British and the Americans were notified by the Polish Government-in-Exile. After the belated Soviet admission, they unsuccessfully pressured the Soviet government for the release of the captives. In June 1945, the 