[[A series of prisoner swaps between Ukraine and Russia — the latest of which came on October 17 — are bringing relief and joy to the families of the released. But human rights activists say that an unknown number of Ukrainians — including some who were captured at the Azovstal steel plant in Mariupol — are still being held in Russia and Russian-occupied territories. Omelyan Oshchudlyak has the story. VOA footage by Yuriy Dankevych.