Both were detained when trying to cross into Dnipropetrovsk Oblast, and one "was found to be wearing a Russian military identification tag around his neck," SBU said.
Artem Koval suffered severe injuries in the drone strike and was taken to hospital. Despite a week of efforts to save him, doctors were unable to overcome his life-threatening injuries, the Vodolaha Village Council said.
The move comes amid increased attention to the worsening humanitarian crisis in the city, which over the past weeks has gained international attention, including from Pope Leo XIV.
Ukrainian Prime Minister Serhii Koretskyi said Russia struck the operating room of the Strazheska Institute of the National Academy of Medical Sciences in Kyiv, injuring one patient.