Azovstal

Azovstal is a vast Soviet-era integrated steel plant on the south-east edge of Mariupol, Ukraine, built in the 1930s and occupying approximately 11 square kilometres along the Azov Sea coast. In April-May 2022 it became the site of the last Ukrainian military resistance in Mariupol, when approximately 2,500 Ukrainian fighters — including marines, territorial defence, and Azov Regiment soldiers — held out for 82 days inside the plant's extensive underground bunker network against Russian siege. The defenders' surrender on 20 May 2022 ended Mariupol's resistance and gave Russia control of the city.

The Azovstal prisoners became among the longest-held and highest-profile Ukrainian captives in Russian custody. In May 2026, as part of the 1,000-for-1,000 prisoner exchange framework agreed at Istanbul, the first 205-for-205 tranche was executed — with many of the returned Ukrainians having been held since the 2022 Azovstal surrender, making them prisoners of almost exactly four years.

The steelworks itself sustained catastrophic damage during the siege and subsequent Russian occupation. Russia-linked companies have reportedly assessed the plant for scrap extraction. Ukraine has stated that Azovstal's reconstruction — and Mariupol's de-occupation — are conditions of any sustainable peace settlement, making the site a symbolic as well as strategic dimension of Ceasefire negotiations.