ATHENS - The leaders of Greece, Albania and Macedonia will meet at the Balkan countries' common border later Friday for talks on the environment.

Greek Prime Minister George Papandreou has called the informal meeting at Lake Prespa to discuss common approaches to environmental problems and climate change with Albania's Sali Berisha and Macedonia's Nikola Gruevski.

Papandreou is expected to hold talks on the sidelines with Gruevski on a name dispute that has soured the two neighbours' relations for the past 18 years.

Greece says it will block Macedonia's EU accession unless the country changes its name - arguing it implies a territorial claim on its own northern region of Macedonia.

U.N.-backed talks have failed to break the deadlock.