US Secretary of State Hillary Clinton arrived in Krakow, southern Poland, Saturday for high level meetings focusing on democracy worldwide, DPA reported.
Clinton was set to attend celebrations marking the 10th anniversary of the Community of Democracies, an international organization focused on promoting democracy.
The meeting was set to include some 70 foreign delegations, and participants including former US secretary of State Madeleine Albright and Jerzy Buzek, president of the European Parliament.
Clinton began the visit in Krakow by laying a wreath at a memorial to the victims of Katyn, some 22,000 Polish officers murdered by the Soviet Red Army during World War II.
The ceremonies also paid tribute to the victims of the April 10 plane crash in Smolensk, Russia, which claimed President Lech Kaczynski and 95 others. Several families of Smolensk victims were in attendance as soldiers lay the wreath near Krakow's Wawel Royal Castle.
Clinton's visit was set to include a visit to Schindler's Factory, a museum at the factory where German businessman Oskar Schindler saved hundreds of Jews during World War II.
She was also expected to declare US support for Poland's Auschwitz-Birkenau Museum, which preserves the former Nazi death camp where Nazis killed some 1.1 million people, mostly Jews.
Clinton was to later meet with Foreign Minister Radoslaw Sikorski, and sign an amendment to a US missile shield deal signed between Washington and Warsaw.
US President Barack Obama announced in September that the US would drop former president George W Bush's plans for a long-range system in favor of a short-and medium-range system to counter Iran's ballistic missile program.
Poland still received a Patriot missile battery, promised under the Bush presidency, which arrived in May at a military base in northern Poland.