"As for the next exchange, I don't want to waste my breath, naming dates or numbers. But we are ready to give three for one to return our guys," he told reporters in Kramatorsk on Wednesday, Censor.NET reports citing Interfax-Ukraine.
Hrytsak said measures will be taken to ensure that all hostages return home. He recalled that 109 Ukrainian citizens are being held in captivity.
The exact whereabouts of 57 Ukrainian soldiers are known, according to the SBU chief.
"The representatives of "LPR" and "DPR" admitted in Minsk they held 47 people. 494 persons are still considered to be missing," Hrytsak said.
He added the swap lists are ready and have been repeatedly provided to terrorists.
Related materials: Anti-Terrorist Operation