Ukraine’s campaign to retake Russian-held territory in the south appeared to take a major step forward as officials on Monday announced the start of a long-awaited counter-offensive against Moscow’s forces. As explosions were reported across the southern frontline, multiple officials confirmed Ukraine’s armed forces had “breached” Russia’s first line of defences around occupied Kherson in social media posts. "The first line of Russian defences on the Kherson front has been breached,” Sergey Khlan, an aide to the ousted Ukrainian head of the Kherson region, said on the Telegram messaging app. "Today there was a powerful artillery attack on enemy positions...