KHARKIV, Ukraine (AP) — Ukrainian troops are piling pressure on retreating Russian forces, pressing deeper into occupied territory and sending more Kremlin troops fleeing ahead of their counteroffensive. The advance has inflicted a stunning blow on Moscow’s military prestige. As the push continued Tuesday, Ukraine’s border guard services said the army took control of Vovchansk — a town just 3 kilometers (2 miles) from Russia seized on the first day of the war. Russian troops were also pulling out of the southern city of Melitopol and heading toward Moscow-annexed Crimea. That’s according to the city’s pre-occupation mayor. His claim could not be verified. Melitopol is the second-largest city in Ukraine’s southern Zaporizhzhia region.