Petrik, a 36-year-old Swedish volunteer, was killed in battle against Russian forces. A former member of the Swedish Armed Forces with two tours in Afghanistan, Petrik joined Ukraine's International Brigade just three weeks after Russia's full-scale invasion began on 24 February 2022. His skills as an engineer and mine-clearing expert made him an invaluable asset to Ukrainian forces. Petrik's father, Thor, told a Swedish broadcaster that his son felt a deep moral obligation to help. "He thought it was very important to stop Russia. He told me, 'This is not right. I have combat experience, and I can do something!" After joining the International Legion, Petrik was later transferred to Ukraine's Intelligence Service, where he fought on the frontlines, cleared mines, and worked with explosives. Despite a serious leg injury sustained in the Kharkiv battle, he returned to the front in eastern Ukraine, even though walking was difficult. A Swedish ground coordinator in Ukraine described Petrik as upbeat and dedicated. "He could have taken a desk job in Kyiv, but he knew there was no one else in our unit to deactivate mines. Despite great odds and lack of ammunition, he always had a smile. He was completely committed to freedom, human rights, and Ukraine's survival as a free nation." Petrik's comrades remember him as a courageous soldier whose impact will not be forgotten. "He made a major difference. He believed Ukraine was important for Europe, and we will never forget him," said one of his fellow fighters.