training, but later released on 22 September while Urey died in captivity. An American citizen was also detained by pro-Russian separatists forces and accused of 'participation in pro-Ukrainian protests'. He was released on 28 October, and reached Ukrainian-controlled territory by 14 December. Foreign fighters and volunteers Excluding the Russian and Ukrainian military casualties, at least 215 combatants and volunteers, foreign citizens or foreign-born, were killed during the war. Another 1,000 had been wounded while fighting on the Ukrainian side. Below is a list of the nationalities of the foreign fighter casualties. A Peruvian citizen was also reported missing while fighting alongside the Ukrainian military. Identification and repatriation Sergiy Kyslytsya, the Ukrainian Ambassador to the United Nations, announced on 27 February 2022, that the country had reached out to the International Committee of the Red Cross for help in the repatriation effort of the bodies of killed Russian soldiers. Due to concerns that Russia was not reporting the number or any casualties of soldiers in Ukraine, the Ukrainian Interior Ministry began issuing appeals that same day for relatives of Russian soldiers to help identify wounded, captured, or killed soldiers. The initiative, called Ishchi Svoikh (), appeared aimed in part at undermining morale and support for the war in Russia and was quickly blocked by the Russian government's media regulator the day the initiative began at the request of Russia's Prosecutor-General's Office. Ukrainian authorities began using facial recognition technology supplied to them by Clearview AI on 12 March 2022, to help identify the deceased, along with potentially using it to uncover Russian spies, vet people at checkpoints and potentially combat misinformation. The Chief Executive of Clearview claimed that the technology could be more effective than matching fingerprints or other identifiable aspects of the individual, although a study by US Department of Energy highlighted the concern of decomposition reducing the effectiveness. Kyiv authorities have also reached out to the International Commission on Missing Persons, which was formed to help after the 1990s Balkan conflicts and the 1995 Srebrenica massacre, and identifies individuals by collecting DNA samples from the deceased and families to cross match. The organization will also document the location of the body and how the individual died. As Russian soldiers began to retreat the identification of the dead civilians who had been unreported due to communication issues and constant fighting began to be reported. Documentation and identification of the bodies began