Today: Prague, Czech Republic, for the European Union summit. Obama will deliver a speech on nuclear nonproliferation and meet with President Vaclav Klaus, former President Vaclav Havel and resigned Prime Minister Mirek Topolanek, who is the current European Union president. Obama is also to meet with Spain's Prime Minister José Luis Rodríguez Zapatero.

Monday: Ankara and Istanbul, Turkey. Obama will meet with Turkish President Abdullah Gul and Prime Minister Tayyip Erdogan.