Turkish President Recep Tayyip Erdogan on Wednesday met with his Russian counterpart Vladimir Putin in Istanbul.

Their meeting came ahead of the launch ceremony of the TurkStream natural gas pipeline project in the city, which the two leaders are set to attend.

The closed-door meeting was held at Istanbul Halic Congress Center and lasted for nearly an hour-and-a-half.

At the meeting, Erdogan presented a book to Putin called Strategic Step on the Eastern Mediterranean Equation: The Turkey-Libya Deal.

Prepared by Turkey’s Communication Directorate in both Turkish and English, the book relates Turkey’s stance on the Eastern Mediterranean as well as

Read more: Erdogan, Putin meet ahead of launch of TurkStream