LVIV, Ukraine, Nov 20 (Reuters) - Russian forces are pounding Ukrainian positions with artillery fire and in the eastern region alone launched almost 400 strikes on Sunday, President Volodymyr Zelenskiy said in a video address.Russia withdrew its forces from the southern city of Kherson this month and moved some of them to reinforce positions in the eastern Donetsk and Luhansk regions, an industrial area known as the Donbas.Zelenskiy also said troops in the south were "consistently and very calculatedly destroying the potential of the occupiers" but gave no details.Oleh Zhdanov, a military analyst based in Kyiv, said that according to his information, offensive battles were taking place on the Bakhmut and Avdiivka frontline in the Donetsk region, among others.Russia calls its invasion in Ukraine a "special operation" to demilitarize and "denazify" its neighbor, not a war."