Turkish President Tayyip Erdogan. Photo: Umit Bektas/REUTERS

Sweden in particular must take a clearer stance against what Turkey considers terrorism. Erdogan said if Sweden doesn’t hand over its terrorists, Turkey can't approve its NATO application.

Swedish Prime Minister Ulf Kristersson said Monday that Sweden is in "a good position" to gain Turkey’s ratification of its membership in NATO.

Last June, Sweden and Finland signed an agreement with Turkey to gain its support for their joining NATO. The two pledged to deal with Turkey's requests for extradition of terrorists quickly and thoroughly.