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, while pro-Russian officials claimed to have halted Kyiv’s forces for now. Russian forces suffered a stunning reversal this month after Ukrainian troops made a rapid armoured thrust in the northeastern region of Kharkiv, forcing a rushed and chaotic Russian withdrawal. Zelenskiy on Wednesday made a surprise visit to Izium – until four days ago Russia’s main bastion and logistics hub i…