Turkey's Prime Minister will tell world leaders next week Ankara can play a key role in stopping a spread of terrorism, including Islamic State (IS), but expected understanding for its own battle against Kurdish militants.

Washington, while considering the Kurdistan Workers Party (PKK) a terrorist group, sees the affiliated YPG Kurdish militia in Syria as its chief ally in fighting IS there.

The link unsettles Turkey and is likely to be raised in more explicit terms by Prime Minister Ahmet Davutoglu when the UN General Assembly convenes in New York next week.

Nato member Turkey has opened its air bases to a US-led coalition against IS fighters, but the focus of its own air strikes has been the PKK.

Fighting has escalated since a truce between the PKK, seeking broader Kurdish rights, and the army broke down in July.

The fighting, in the run-up to November elections, has raised suspicions among opponents of President Tayyip Erdogan that the priority is to check Kurdish territorial ambitions rather than to rout the Islamist insurgents.

A senior Turkish official said: "Turkey will share its experience with world leaders to seek support to prevent the Middle East from becoming a region that exports terrorism to the world."