Ankara had accused Finland and especially Sweden of offering a safe haven to Kurdish militants who have been waging decades-long insurgency against the Turkish state.
The two Nordic countries also agreed to lift their embargoes on weapons deliveries to Turkey, which were imposed in response to Ankara’s 2019 military incursion into Syria.
Turkey signed a memorandum with Finland and Sweden on Tuesday supporting the invitation for the Nordic countries to become members of NATO, the Finnish presidency said.
NATO allies including Britain hailed the agreement.
‘Addresses Turkey’s concerns’
The move comes after NATO secretary general Jens Stoltenberg mediated talks in Madrid between Erdogan and the leaders of Sweden and Finland.
“I’m pleased to announce that we now have an agreement that paves the way for Finland and Sweden to join NATO,” he said.
The agreement “addresses Turkey’s concerns, including around arms exports, and the fight against terrorism,” he added.
Swedish Prime Minister Magdalena Andersson on Tuesday hailed a “very good agreement” with Turkey but insisted Sweden had not made too many concessions to Erdogan.
“Taking the next step toward a full NATO membership is of course important for Sweden and Finland. But it’s also a very important step for NATO, because our countries will be security providers within NATO,” Andersson told AFP in an interview.
British Prime Minister Boris Johnson also welcomed the agreement.
“Sweden and Finland’s membership will make our brilliant alliance stronger and safer,” Johnson wrote on Twitter.
Sweden and Finland went into the NATO meeting open to the possibility that Turkey might only lift its objections after the summit concludes on Thursday.
US hails Turkey’s decision
A US official insisted on Tuesday that no concessions were given to Turkey to secure its green light.
“There was no request from the Turkish side for the Americans to make a particular concession,” a senior administration official told reporters.
Speaking on condition of anonymity, the official called Turkey’s decision a “powerful shot in the arm” for NATO unity.
Erdogan is expected to meet with US President Joe Biden on Wednesday on the sidelines of the gathering focused on responding to the Kremlin’s invasion of its pro-Western neighbour.
Erdogan and Biden have had a chilly relationship since Biden’s election because of US concerns about human rights under Erdogan.
Biden and Erdogan last met briefly in October on the sidelines of a G20 summit in Rome.
Fighter jet talks
Erdogan’s ability to maintain a close working relationship with Russian President Vladimir Putin while supporting Ukraine’s war effort has made him an important player in the conflict.
But those ties have also complicated his relations with Biden and NATO.
Washington has sanctioned Ankara for taking delivery of an advanced Russian missile defence system in 2019.
The purchase saw the United States drop Turkey from the F-35 joint strike fighter programme and impose trade restrictions on its military procurement agency.
But Washington has signalled it may be willing to move past the dispute.
Biden’s administration has dangled the possibility of supplying Ankara with older-generation F-16 jets that could replenish Turkey’s ageing air force fleet.
“The most important issue is the F-16 issue. It is still on the table,” Erdogan said of his upcoming talks with Biden.