President Tayyip Erdogan said he had told US President Joe Biden at their first meeting that Turkey would not change its stance on its Russian S-400 missile defences over which Washington sanctioned Ankara, state media reported on Thursday.
Biden and Erdogan sounded upbeat after their face-to-face talks on Monday, although the NATO allies did not announce any major breakthroughs in disputes including the S-400s, Syria and other issues.
Ankara's purchase of the S-400s has strained ties with the United States and NATO allies over concerns that the systems are not compatible with the alliance's defences and may threaten the US F-35 fighter jets. Turkey, which was expelled from the jet programme over the Russian systems, rejects the concerns.
"I told (Biden) that they should not expect Turkey to take a different step on the F-35 and S-400 issues because we did what we had to for the F-35s and gave the necessary money," Erdogan told reporters on a return flight from Azerbaijan.
"We must monitor developments closely. We will be following up on all our rights," he said. "In the next period, our foreign ministers, defence ministers and defence industry chairs will be moving this process forward by meeting with their counterparts."
Ankara and Washington have been trying to put aside their differences and focus on areas of cooperation, such as Afghanistan and Syria, although Turkey has been infuriated by US support for the Kurdish YPG militia in Syria, which it considers a terrorist group.
Erdogan said he conveyed Turkey's views on the issue at his meeting with Biden, state-run Anadolu news agency reported.
Turkey has also offered to guard and operate Kabul's airport after US and NATO forces withdraw. NATO head Jens Stoltenberg said on Monday that Turkey would play a key role there but that no decision was made at the summit.
"Following the US decision to withdraw from Afghanistan, Turkey can take up a lot more responsibilities here," Erdogan said, without elaborating.
Last week, the Taliban said Turkey should withdraw troops from Afghanistan under the 2020 US pullout deal, effectively rejecting Ankara's proposal over the Kabul airport. The Taliban in April also refused to participate in a peace conference on Afghanistan hosted by Turkey.
Erdogan said on Monday that Turkey would continue talks with the Taliban on the issue, but that there were no issues with the planning of the airport mission.