Officials from the three countries held their first such meeting on Friday in the southern Finnish city of Vantaa.

Finland's Foreign Minister Pekka Haavisto said the meeting aimed to establish contacts and set goals for cooperation that the countries agreed to by signing a memorandum of understanding at NATO's Madrid summit in June.

"The participants discussed the concrete steps to implement the Trilateral Memorandum and agreed that the mechanism will continue to meet at the expert level during the autumn," the Finnish foreign ministry said in a statement after the meeting.

The two Nordic countries applied for NATO membership in response to Russia's invasion of Ukraine, but faced opposition from Turkey which accused them of imposing arms embargoes on Ankara and supporting groups it deems terrorists.

President Recep Tayyip Erdogan's office said the sides had agreed to intensify their cooperation and fight terrorism.

"Finland and Sweden will show full solidarity and cooperation with Turkey in the fight against all forms and manifestations of terrorism... [and] they reiterated their commitment not to provide support to these organizations," it said.

Turkish Foreign Minister Mevlut Cavusoglu has demanded Sweden and Finland extradite suspects Turkey seeks over terrorism-related charges, while the Nordic countries say they have not agreed to specific extraditions.

Finland's foreign ministry had been tight-lipped about Friday's meeting, refusing to give its location or timing, but later said it had taken place in the city of Vantaa near the capital Helsinki.