By Tom Balmforth and Jonathan Landay KYIV (Reuters) -Russian Defence Minister Sergei Shoigu ordered his troops to withdraw from the west bank of the Dnipro River near the strategic southern Ukrainian city of Kherson, a significant setback for Moscow and potential turning point in the war. Ukraine reacted with caution to Wednesday’s announcement, saying some Russian forces were still in Kherson and additional Russian manpower was being sent to the region. “Until the Ukrainian flag is flying over Kherson, it makes no sense to talk about a Russian withdrawal,” Mykhailo Podolyak, a senior adviser …