By David Ljunggren (Reuters) -Russian forces destroyed the critical infrastructure in the southern city of Kherson before fleeing, Ukrainian President Volodymyr Zelenskiy said on Saturday, adding that local authorities were starting to stabilise the city. But pro-Moscow forces are putting up a much stiffer fight elsewhere and Zelenskiy said the battles in the eastern Donetsk region were hellish. Jubilant residents welcomed troops arriving in the centre of Kherson on Friday after Russia abandoned the only regional capital it had captured since the start of the war. “Before fleeing from Kherson,…