Turkish President Tayyip Erdogan will attend a round of talks with the leaders of Sweden and Finland, as well as NATO on Tuesday ahead of the summit in Madrid, Turkish presidential spokesman Ibrahim Kalin said Sunday.

Finland and Sweden applied for NATO membership in response to Russia’s invasion of Ukraine. But the bids have faced opposition from Turkey, which has been angered by what it says is Helsinki and Stockholm’s support for Kurdish militants and arms embargoes on Ankara.

Speaking to broadcaster Haberturk, Kalin said he and Deputy Foreign Minister Sedat Onal would also attend a round of talks with Swedish and Finnish delegations in Brussels on Monday.

“There will be a four-way summit in Madrid at the leader level in Madrid upon the request of the NATO secretary-general with the attendance of our president,” he said.

Kalin said Erdogan attending the talks with Sweden, Finland and NATO on Tuesday “does not mean we will take a step back from our position.”

“We have brought negotiations to a certain point. It is not possible for us to take a step back here,” he also said of the upcoming talks.

Kalin said Turkey and the Nordic countries had largely agreed on issues and would be in a better position in Madrid— if they could agree on them during talks Monday.