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U.S. President Barack Obama places a stone in memory of Swedish diplomat Raould Wallenberg at the Stockholm Synagogue

U.S. President Barack Obama places a stone in memory of Swedish diplomat Raould Wallenberg at the Stockholm Synagogue September 4, 2013. Wallenberg issued thousands of protective passports to jews in nazi-occupied Hungary in 1944-45. Obama is on a two-day official visit to Sweden. REUTERS/Claudio Bresciani/Scanpix (SWEDEN - Tags: POLITICS) ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. SWEDEN OUT. NO COMMERCIAL OR EDITORIAL SALES IN SWEDEN. NO COMMERCIAL SALES

Obama 'to raise Wallenberg fate with Russia'

US President Barack Obama will ask Moscow what happened to Swedish Holocaust hero Raoul Wallenberg after he was taken into Soviet custody and disappeared in 1945, Wallenberg's family told Swedish media. (AFP)