BRUSSELS, Belgium-Greek Foreign Minister Dora Bakoyannis said Thursday that U.N.-mediated talks to resolve a name dispute with Macedonia will resume in Vienna next week.

Bakoyannis spoke to reporters after talks with Macedonian Prime Minister Nikola Gruevski in the margins of an EU leaders summit made no progress.

"I reiterated Greece's position and he reiterated his position," Bakoyannis said.

Greece has threatened to block Macedonia's effort to join NATO because of the dispute, which has clouded relations between the two neighbors for 17 years.

She said talks would be held in Vienna on Monday, led by U.N. envoy Matthew Nimetz.

Bakoyannis said Athens remains "optimistic" a solution can be found before a NATO leaders summit April 2-4. Macedonia is expected to be invited at that gathering to join the alliance.

Greece is at odds with Macedonia over the country's name, which Athens says implies territorial claims on the northern Greek province of Macedonia, and has warned it would block the country's efforts to join NATO and the European Union unless the dispute was resolved.

It refers to its neighbor as the Former Yugoslav Republic of Macedonia, the name also used on an interim basis by the United Nations and other international organizations.

Nimetz has proposed five alternative names that Macedonia could consider adopting: Constitutional Republic of Macedonia, Democratic Republic of Macedonia, Independent Republic of Macedonia, New Republic of Macedonia, and Republic of Upper Macedonia.

NATO nations have said that excluding Macedonia from NATO could add to instability in the Balkan region, which is already tense over Kosovo's recent declaration of independence from Serbia.