(Reuters) -Twenty-seven people were killed and 25 injured when Ukrainian forces shelled the Russian-controlled city of Donetsk in eastern Ukraine, Denis Pushilin, the Russian-appointed head of the Donetsk region, said on Sunday. According to Alexei Kulemzin, the city’s Russian-installed mayor, Ukrainian forces bombarded a busy area where shops and a market are located. Pushilin said the city was shelled by Ukrainian artillery. Reuters photographs and video taken at the scene showed crying people, some of whom said they had lost relatives, and bodies lying on blood-soaked snow near one of the c…