- Russia sacks senior military commander- Ukraine buoyed by weekend capture of Lyman in eastSVIATOHIRSK/KYIV, Oct 3 (Reuters) - Ukrainian forces achieved their biggest breakthrough in the country's south since the war began, bursting through Russian defences 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.Since the start of September Ukrainian forces have swiftly seized territory in the country's east to gain control of Russian supply lines, cutting off larger Russian forces and forcing them to retreat.That has opened the way for it to advance deep into Luhansk province, threatening supply routes to territory Moscow captured in some of the war's bloodiest battles in June and July."My son was wounded by shrapnel, and they took him to the hospital in Kramatorsk," said Lyudmyla, 64, who declined to give her last name, standing outside a bullet-pitted Ukrainian Orthodox church in whose basement more than 100 people took refuge during fighting."