Ukraine makes major new breakthrough on southern front, days after supposed annexation Russian sources say a Ukrainian tank offensive has advanced dozens of kilometres along Dnipro River Ukrainian forces achieved their biggest breakthrough in the south of the country since the war began in February, bursting through the front and advancing rapidly along the Dnipro River on Monday, threatening supply lines for thousands of Russian troops.Kyiv gave little information about the gains in the south, but Russian sources acknowledged that Ukrainian troops had advanced dozens of kilometres along the river's west bank, recapturing a number of villages along the way.The breakthrough mirrors recent Ukrainian successes in the east that have turned the tide in the war against Russia, even as Moscow has tried to raise the stakes by annexing territory, ordering mobilization and threatening nuclear retaliation.advanced dozens of kilometres along the river's west bank, recapturing a number of villages along the way.Similar tactics in the east The advance in the south mirrors the tactics that have brought Kyiv major gains since the start of September in Eastern Ukraine, where its forces swiftly seized territory to gain control of Russian supply lines, cutting off larger Russian forces and forcing them to retreat."