U.S. Secretary of State Hillary Clinton has arrived in Bulgaria for talks that are expected to focus on energy security.

During her brief visit on Sunday, Clinton is scheduled to meet with President Rosen Plevneliev and Prime Minister Boyko Borissov.

The top U.S. diplomat is expected to urge the eastern European country to develop new energy sources and break its dependence on Russia for its oil and gas supplies.

Officials say developments in the Middle East also are on the agenda.

Clinton flew to Bulgaria from the German city of Munich, where she attended an international security conference on Saturday.