Turkey violated agreements by releasing detained commanders of a a unit that for weeks defended a steel works in the Ukrainian city of Mariupol, Kremlin spokesman Dmitry Peskov said on Saturday.
Peskov, quoted by RIA news agency, said under the terms of a prisoner exchange the fighters were to remain in Turkey until the end of the war. Russia had not been informed of their release, he said.
President Volodymyr Zelensky returned to Ukraine from Turkey on Saturday and brought with him five commanders of the former garrison in Mariupol, saying he was "bringing our heroes home".