An Anda Air McDonnel Douglas MD-83, registration UR-CPB performing flight 5G-2521 from Kiev Zhuliany (Ukraine) to Antalya (Turkey), was climbing out of Zhulyani Airport's runway 26 when the crew stopped the climb at about 8000 feet due to a problem with the cabin pressurization and returned to Zhulyani for a safe landing on runway 26 about 20 minutes after departure. The occurrence aircraft remained on the ground for about 6:20 hours, then departed again and reached Antalya with a delay of 7 hours.