Turkish President Recep Tayyip Erdogan is meeting with his Russian counterpart Vladimir Putin in Istanbul.

The Wednesday’s meeting is being held ahead of the launch ceremony of TurkStream natural gas pipeline project in the city, which the two leaders are set to attend.

Serbian President Aleksandar Vucic and Bulgarian Prime Minister Boyko Borisov are also expected to attend the ceremony.

Security measures are high in the city, as a total of 7,200 police officers are on duty for the inauguration ceremony.

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