Twenty-seven people were killed and 25 injured when Ukrainian forces shelled the Russian-controlled city of Donetsk in eastern Ukraine, according to Denis Pushilin, head of the Donetsk region appointed by Russia, in an account disputed by Kyiv.

Pushilin said Sunday the city was shelled by Ukrainian artillery. According to Alexei Kulemzin, the city's Russian-installed mayor, Ukrainian forces bombarded a busy area where shops and a market are located.

Ukraine's forces in the Tavria, or southern zone, said in a Facebook post that soldiers under its command were not responsible. "Donetsk is Ukraine!" it said. "Russia will have to answer for taking the lives of Ukrainians."