By Tom Balmforth and Jonathan Landay KYIV/NOVOOLEXANDRIVKA, Ukraine (Reuters) -Russian Defence Minister Sergei Shoigu on Wednesday ordered his troops to withdraw from the west bank of the Dnipro River in the face of Ukrainian attacks near the southern city of Kherson, a significant retreat and potential turning point in the war. Ukraine reacted with caution to the announcement, saying some Russian forces were still in Kherson. “Until the Ukrainian flag is flying over Kherson, it makes no sense to talk about a Russian withdrawal,” Mykhailo Podolyak, a senior adviser to Ukrainian President Volod…