Pakistan's President Asif Ali Zardari arrived in Istanbul on Sunday, Anadolu Agency reported.
Zardari will meet with Turkish President Abdullah Gul and Afghanistan's President Hamid Karzai at a dinner to be hosted by Gul later this evening.
On Monday, Zardari will participate in the tripartite summit of Turkey-Afghanistan-Pakistan together with Gul and Karzai.
He is also scheduled to take part at the "Summit of Friendship and Cooperation in the Hearth of Asia" on Tuesday.