Turkey will not lift its opposition to Sweden joining NATO unless it stops harbouring groups Ankara considers to be terrorists, President Tayyip Erdogan said on Monday.

Sweden and Finland applied for NATO membership last year, ditching long-held policies of military non-alignment after Russia’s invasion of Ukraine. Applications for membership must be approved by all NATO members, but Turkey and Hungary have yet to clear Sweden’s bid.

Turkey has repeatedly said that Sweden needs to take additional steps against supporters of the outlawed Kurdistan Workers’ Party (PKK) and members of a network Ankara holds responsible for a 2016 coup attempt. Turkey treats both groups as terrorist organisations.

Turkey expects Sweden to stop harbouring members of both groups, Erdogan said in a speech after a cabinet meeting.

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“Everyone should acknowledge that they cannot form a friendship with Turkey by allowing terrorists to demonstrate in the most central squares of their cities,” he said.

In recent months, demonstrators in Stockholm waved flags showing support for the PKK, which is also deemed a terrorist group by Turkey’s Western allies, including Sweden.

Read more: Reuters