In this handout photo released by the Russian Defence Ministry, medics put protective face masks on during the coronavirus disease outbreak at a clinic, in Belgrad, Serbia. Russian military personnel of the Nuclear, Biological and Chemical Protection units of the Russian Armed Forces have sanitized 26 medical facilities in Serbia. Military medics also examine the current epidemiological situation in Serbia, and three teams of physicians and nurses work to treat patients who have tested positive for COVID-19 in the cities of Cuprija and Krusevac. Editorial use only, no archive, no commercial use.