Turkey's foreign minister said Sunday that Sweden and Finland should stop supporting terrorist groups in their countries, offer clear security guarantees and lift export bans on Turkey as they seek NATO membership.

Speaking after a meeting of NATO foreign ministers in Berlin, Mevlut Cavusoglu said he had met with his Swedish and Finnish counterparts and everyone was seeking to address Turkey's concerns, the Telegraph reported.

He added that Turkey was not threatening anyone or seeking favors, but was talking specifically about Sweden's support for the Kurdish militant group PKK, considered a terrorist group by Turkey.

Finland confirmed on Sunday that it would apply for NATO membership, and Sweden is expected to follow suit, in response to the Russian invasion of Ukraine.

However, Turkey's concerns could be a hindrance, as any decision on NATO enlargement requires the unanimous approval of all 30 member states.

"There must be a guarantee of security here.

"They must stop supporting terrorist organizations," Cavusoglu told Turkish journalists in Berlin.

He added that the Swedish and Finnish bans on exporting some of their defense sector goods to Turkey should end.

"Our position is completely open and clear.

"This is not a threat, this is not a negotiation where we are trying to use our interests," he said.

"It's not populism either."

Otherwise, Turkish President Recep Tayyip Erdogan surprised NATO allies and the Nordic countries on Friday when he said that Turkey could not support the enlargement plans as they were "the home of many terrorist organizations", but his spokesman told Reuters to on Saturday that Turkey had not closed the door.

Cavusoglu reiterated that Turkey, which joined NATO 70 years ago, does not oppose its open-door policy.

He even stressed that talks with Swedish and Finnish counterparts - who were given evidence of terrorists living in their countries - were good and that they made suggestions to allay Ankara's concerns.