The EU's Commissioner for Enlargement, Stefan Fuele, is visiting Turkey in an attempt to give new impetus to Ankara's stalled bid to join the bloc.
Turkey opened accession talks with the EU in 2005, but they have been stalled for two years because some EU leaders oppose its membership and Turkey refuses to recognise Cyprus.
Both sides launched a new "positive agenda" in Ankara on Thursday.
The 27-nation EU is by far the largest consumer of Turkish exports.
"Our aim is to keep the accession process alive and put it properly back on track, after a period of stagnation which has been a source of frustration on both sides," Mr Fuele said in Ankara.
The BBC's Jonathan Head in Istanbul says the high hopes and euphoria that accompanied the start of Turkey's EU accession talks seven years ago have collapsed into a mess of mutual recriminations.
It has been two years since Turkey opened any new negotiating chapters out of the 35 it needs to complete before it can join the EU. Only one chapter has been finished, and more than half are blocked.
With Cyprus about to take up the rotating presidency of the EU, relations will be even more strained, our correspondent says.
Turkey does not allow ships or planes from Cyprus to use its ports and airports. The division of Cyprus remains a major sticking point, with the Turkish-controlled north of the island recognised only by Ankara.