Netherlands

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Russian Foreign Minister Sergey Lavrov, left, arrives at Schiphol Amsterdam airport, Netherlands, Sunday March 23, 2014, one day ahead of the March 24 and 25 Nuclear Security Summit. (AP Photo/Sean Gallup, Pool)

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U.S. President Barack Obama, center, views the Act of Abjuration, widely considered to be the source document for the U.S. Declaration of Independence, during a tour of the Rijksmuseum with Museum Director Wim Pijbes, left, Prime Minister of the Netherlands Mark Rutte, right, and Mayor of Amsterdam Eberhard van der Laan, in Amsterdam, Netherlands, Monday, March 24, 2014. Obama is in the Netherlands for the Nuclear Security Summit. Obama also viewed the first trade and friendship agreement to be signed between the Netherlands and the USA in 1782, as well as other documents in the Rijksmuseum collection. (AP Photo/Pablo Martinez Monsivais)

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Roger Federer, of Switzerland, returns to Thiemo de Bakker, of the Netherlands, at the Sony Open tennis tournament in Key Biscayne, Fla., Sunday, March 23, 2014. (AP Photo/Alan Diaz)