Baku. TurkicWorld:

Turkey's president has warned that Finland and Sweden's entry into NATO would carry security risks for his country and the organisation itself, reports TurkicWorld with the reference Euronews.

“Turkey maintains that the admission of Sweden and Finland entails risks for its own security and the organisation’s future,” President Recep Tayyip Erdogan wrote in an article published by The Economist late Monday.

Erdogan said the activities of the Kurdistan Worker's Party (PKK) are part of the reason why Turkey is objecting to Sweden and Finland joining the defensive alliance.

The PKK has waged a 38-year insurgency against Turkey for Kurdish independence, which has led to tens of thousands of deaths.

It is designated as a terror group by the United States and the European Union, including Sweden and Finland.

However, there has been friction between Ankara and other NATO members over the West's stance towards the PKK's wing in Syria, the People's Protection Units (YPG).

The YPG has played a key role in fighting the Islamic State on the ground in Syria, alongside the US-led coalition.

Referring to the core principle of NATO, which states that all 30 signatories to the treaty must come to the aid of another if it is attacked, Erdogan wrote: “We have every right to expect those countries, which will expect NATO’s second-largest army to come to their defence under Article 5, to prevent the recruitment, fundraising and propaganda activities of the PKK."