By Pavel Polityuk and Aleksandar Vasovic LVIV/KYIV, Ukraine (Reuters) -Russian President Vladimir Putin said on Sunday his campaign in Ukraine was going to plan and would not end until Kyiv stopped fighting, as efforts to evacuate 200,000 people from the heavily bombarded city of Mariupol fell apart for a second day in a row. Most people trapped in the port city are sleeping in bomb shelters to escape more than six days of near-constant shelling by encircling Russian forces that has cut off food, water, power and heating supplies, according to the Ukrainian authorities. The civilian death toll…