"We are aware of reports of this incident and condemn any violence on civilians or medical facilities," a Foreign Office spokesman told RIA Novosti.
Russian Defense Ministry spokesman Maj. Gen. Igor Konashenkov said Monday militants of the so-called Syrian opposition attacked a Russian mobile military hospital in Aleppo, killing two Russian military medics and wounding one. Local residents also sustained wounds.
Earlier in the day, Kremlin spokesman Dmitry Peskov expressed regrets that the international community showed a rather reserved reaction to the shelling.
Over recent months, Aleppo became major battleground in Syria, engaging government forces, jihadists, and numerous opposition groups. Eastern Aleppo is currently encircled by government troops, and the fighting has affected thousands of civilians still trapped in the city.