By Tom Balmforth IZIUM, Ukraine (Reuters) – President Volodymyr Zelenskiy promised he would lead Ukraine to victory in its war against Russia as he visited shrapnel-blasted, recently recaptured towns on Wednesday, but pro-Russian officials said they had halted Kyiv’s forces for now. Russian forces suffered a stunning reversal this month after Ukrainian troops made a rapid armoured thrust with special forces in the northeastern region of Kharkiv, forcing a sometimes rushed and chaotic Russian withdrawal. Zelenskiy on Wednesday made a surprise visit to the town of Izium, around 15 km (9.3 miles)…