Vienna: Austria's foreign minister has threatened to block the expansion of negotiations with Turkey on its accession to the European Union, which could scupper a landmark migration deal between Brussels and Ankara.

Foreign Minister Sebastian Kurz's comments, published on Sunday, risk exacerbating a row between Austria and Turkey that flared last week when Austrian Chancellor Christian Kern suggested ending Turkey's EU membership talks altogether because of the country's democratic and economic deficits.

Talks on Turkish accession have made only slow progress since they began in 2005. Credit:Peter Braig

Talks on Turkish accession have made only slow progress since they began in 2005, with just one "chapter" concluded of 35 such policy areas where Turkey must adopt and implement EU rules.

"I have a seat and a vote in the (EU) foreign ministers' council. There the question is whether new negotiation chapters will be opened with Turkey, and I am against it," Kurz said in an interview with Austrian daily Kurier, threatening to block the unanimous agreement required.