Relations between Turkey and its NATO allies have been strained over a host of issues, ranging from Ankara's decision to procure Russian air defence systems to Syria policy. Several NATO members condemned Turkey's decision to launch an offensive into northeastern Syria against the Kurdish YPG militia.
Ankara has refused to back a NATO defence plan for the Baltics and Poland until it receives more support for its battle with the YPG, which it views as a terrorist organisation.
Ahead of his departure from Ankara for the NATO summit, Erdogan said he had spoken to Polish President Andrzej Duda on the phone on Monday and had agreed to meet with him and leaders of Baltic countries in London to discuss the issue.
Turkey, France, Germany and the United Kingdom are expected to hold a separate meeting on the sidelines of the NATO summit. Erdogan said they would mainly discuss Turkish plans to establish a safe zone in northeast Syria, which has until now been met with criticism from Ankara's European allies.