As he spoke of Wallenberg, Obama appeared to make a veiled reference to the choice that confronts him about using military force in retaliation for a deadly chemical weapons attack in Syria, where more than 100,000 people have already died in a civil war. The president spoke of "our power when we choose, not simply to bear witness, but also to act."
Wallenberg's family had planned to present a letter to Obama asking for help in pressing Russia to shed light on Wallenberg's fate.
Obama also ate dinner Wednesday night with other Nordic leaders from Norway, Iceland, Finland and Denmark.
Associated Press writers Josh Lederman, Karl Ritter and Malin Rising in Stockholm and Jack Gillum in Washington contributed to this report.
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