NATO Secretary General Jens Stoltenberg has called on Turkey and Germany to sort out their differences amid a growing diplomatic dispute.
Germany moved to withdraw its forces from a military base in Turkey after the Turkish government blocked access for German lawmakers.
German Chancellor Angela Merkel says a dispute with Turkey over a visit by lawmakers to air crews at a North Atlantic Treaty Organisation base is "decidedly unfortunate" and Berlin will work with North Atlantic Treaty Organisation to defuse it.
Germany has refused to extradite asylum seekers who were involved in the Gülenist-led failed coup attempt a year ago, and Ankara has refused to let German lawmakers visit soldiers at two air bases.
German Chancellor Angela Merkel said Sunday that the talks with Turkey regarding German lawmakers' visiting German troops stationed in North Atlantic Treaty Organisation bases located in Turkey would continue, but refused to "negotiate".
Merkel said the German government would "outright" refuse to negotiate with Turkey to get green light for German MPs to visit the North Atlantic Treaty Organisation bases in return for cooperation with the Turkish government on the suspects who are under investigation over ties with the Gülenist Terror Organization (FETÖ) in Turkey and seeking aslyum in Germany.
In an interview with public television ARD on Sunday, Merkel said current disputes between Berlin and Ankara should be resolved through bilateral talks, and talks among the allies at North Atlantic Treaty Organisation. "This whole issue is unfortunate, very unfortunate".
Merkel and Erdogan met at the G20 summit in Hamburg last week.