Taken prisoner by the Germans, he was handed over to the USSR in accordance with the Ribbentrop-Molotov Pact and then executed by the NKVD some time in 1940 during the infamous Katyn massacre.
Taken into German custody, he was subsequently delivered to the Soviet Union under the Ribbentrop-Molotov Pact and then put to death by the NKVD during the Katyn massacre of 1940.