By Riham Alkousaa and Fanny Brodersen BERLIN (Reuters) – Berlin’s Pilecki Institute, which is dedicated to researching 20th century history including Nazi crimes in World War Two, is tapping that experience to collect testimonies from refugees about possible war crimes in Ukraine. The International Criminal Court (ICC) started a formal investigation into possible war crimes and crimes against humanity in Ukraine after Russia invaded on Feb. 24. The Pilecki Institute, named after a Polish cavalry officer who risked his life to document the situation in the Auschwitz concentration camp during Wo…