Turkey requests that Sweden take "concrete actions" against terrorism in order to earn support for its NATO candidature.

Turkey has warned Sweden that it must take "concrete steps" against terrorism, which Ankara claims Stockholm supports in the name of free speech, if it wants to join the US-led NATO alliance amid Russia's ongoing offensive in Ukraine.

"We don't see a satisfactory level of implementation," Turkey's vice president Cevdet Yilmaz was quoted as saying by the Financial Times.

Turkey is fighting a resurgence of Kurdish insurgents, as evidenced by an attack near the parliamentary building in Ankara on Sunday (Oct 1), just before the start of a parliament session.

Sweden's NATO bid and Turkey's opposition: Latest sequence of events

Turkey's President Recep Tayyip Erdogan stated in July that Ankara would no longer oppose Sweden's request to join NATO.

However, Erdogan's purported commitment to allow Sweden to join NATO must be ratified by the Swedish parliament. The parliament reconvened on Sunday, but the agenda was overshadowed by a suicide bombing near the parliamentary premise.

During the NATO summit in July, while Erdogan agreed to allow Sweden to join the US-led military alliance, his Justice and Development Party (AKP) allies in parliament asserted that Stockholm must act against alleged Kurdish separatists if it is to join NATO.

The Kurdish group Kurdistan Workers' Party (PKK) is accused of orchestrating a coup attempt in 2016.

Ylmaz also warned Sweden that, because these issues are so important to Ankara, the parliament would be put under a lot of pressure if Stockholm did not take significant steps. Sweden agreed with Turkey last year to take tough measures against extremist organisations, including the Kurdish militant group.

"Because there is public opinion in Turkey," Ylmaz said, "our parliament is very sensitive about these issues."

"If we don't see enough progress in practise, the parliament will be put under tremendous strain."

Ylmaz went on to say that if "real concrete steps are taken," it would be fairly dependent on parliamentary approval.