The Kremlin-installed officials who had been occupying the southern Ukrainian city of Kherson said on Saturday that they had set up a new administrative capital in a seaside resort town about 110 miles to the east. “Today, the temporary administrative capital of the Kherson region is Henichesk,” Aleksandr Fomin, a representative of the region’s administration, told reporters. “All the main authorities are concentrated there.” The move comes less than a month and a half after Moscow moved to annex the region, with its capital in Kherson city. But as Ukrainian forces advanced with a counteroffensive aimed at recapturing territory in...