Turkish President Recep Tayyip Erdogan urged Sweden to end financial and political support, as well as supply of weapons, to "terrorist organizations" during his phone talks with Swedish Prime Minister Magdalena Andersson on Saturday, Turkish media outlet Anadolu Agency reported.

Erdogan told the Swedish leader of Ankara's concerns about activities by the "Kurdistan Workers' Party, or PKK and FETO terror groups in Sweden."

The Turkish president said on Thursday that Turkey would oppose Sweden and Finland joining NATO.

Turkey's objection stems from grievances with Sweden's – and to a lesser degree with Finland's – perceived support for the PKK, and an armed group in Syria that Turkey sees as an extension of the PKK, the AP reported. 

Finnish President Sauli Niinisto said on Saturday that "Finland condemns terrorism in all its forms and manifestations," after his phone call with Erdogan.

Niinisto tweeted that, "as NATO Allies, Finland and Turkey will commit to each other's security and our relationship will thus grow stronger, and close dialogue continues."