Our correspondent had an opportunity to speak with some of them.
Citizen of Kharkiv Oleksii Kyrychenko, a fighter of legendary Major General Ihor Hordiichuk's group, was captured in August 2014 near Savur Mohyla. Of all those captured there, he is the only one who is still not freed, his brother Yurii said.
According to Halyna, the mother of the last captive defender of the Donetsk airport Taras Kolodii, her son was among those Ukrainian fighters seized after militants took the building. During three weeks, the family didn't know his whereabouts, but Taras made contact soon. In June 2016, he was transferred to Yenakiieve penal colony.
"The guys told me he screams there every night and needs psychological assistance. They have to free my son," Halyna said.
Roman Onyshchuk, a soldier of the 24th Brigade, was captured while on a mission in the Luhansk region on June 15, 2015. It has been a year since he last spoke to the family. After that, his whereabouts have remained unknown.