NATO members rallied around Finland and Sweden on Sunday after they announced plans to join the alliance, marking another dramatic change in Europe’s security architecture triggered by Russia’s war in Ukraine.

Gathering in Berlin over the weekend, most NATO foreign ministers embraced the bloc’s northern enlargement, a process that requires unanimity among the 30 allies. The one country to voice concerns was Turkey, with Foreign Minister Mevlut Cavusoglu unhappy that Finland and, particularly, Sweden have had relations with Kurdish militants who have been active in eastern Turkey.

Sweden is sending a team of diplomats to Ankara for talks this week and NATO Secretary-General Jens Stoltenberg said he expects to work through the last-minute wrinkles in the enlargement plan.