 Complete the following phrase:  After the Polish-Soviet War and the Peace of Riga in 1921 he moved back to Poland. In 1930 he finished the Tytus Chałubiński National Gymnasium in Radom and then studied at the Law School of Warsaw University. He graduated in 1934. In 1939, in the wake of the Nazi invasion of Poland, Kossoy fled Warsaw and escaped eastward to Lviv which was taken over by the Soviet Union after the 