Better photo available here: https://english.nv.ua/russian-war/ukraine-begins-treating-soldier-scarred-with-glory-to-russia-phrase-from-russian-captivity-50522497.html

The words, written in Russian, were branded into the right side of the body alongside the letter “Z,” a symbol of the full-scale invasion that many Ukrainians and critics of the war liken to the Nazi swastika.

According to the United Nations, more than 95% of freed Ukrainian POWs have said they were tortured during their captivity. Survivors have recounted harrowing treatment, including being brutally beaten, electrocuted, and forced to endure painful stress positions.
Many have faced mock executions, threats of rape or death, and were denied basic medical care. Some were left without food, locked in isolation for weeks, or permanently marked with burns or scars.

For Turkevych and his team, seeing the scars left by Russian captivity on Ukrainian POWs has become a routine part of their work.

[…] Turkevych and his team have treated several released defenders bearing swastika-shaped scars, some even on their foreheads […]