Swedish Minister of Foreign affairs Ann Linde. AFP
Turkish President Recep Tayyip Erdogan has accused Sweden and Finland of being havens for Kurdish militants, specifically from the outlawed Kurdistan Workers' Party (PKK), which he has sought to crush, and for promoting "terrorism".
He has threatened to block the Nordic states' bid to join NATO unless they extradite dozens of alleged "terrorists" under a deal the three signed last month.
The Swedish foreign ministry said its diplomat had been called to a "meeting" in Ankara on Saturday, without elaborating.
Turkey's display of displeasure follows events in Sweden last week to commemorate the 10th anniversary of the Kurdish uprising in northern Syria, which borders Turkey.
Turkey is threatening to launch a new military offensive against Kurdish-controlled areas of northern Syria, where he wants to establish a buffer zone 30 kilometres (20 miles) deep.