A Syrian man outside the rubble of a building after an alleged bombing by Syrian government forces on Monday in Aleppo. Agence France-Presse/Getty Images REYHANLI, Turkey—Syrian government forces have nearly encircled Aleppo, preparing a siege to wrest control of the city from rebels in what would be the biggest blow yet to the three-year uprising. The fall of Aleppo, Syria’s largest city and economic hub before the fighting, could also bolster the ranks of Islamic State militants who continue to make gains across the country, as defeated members of the Western-backed Free Syrian Army switch to their side. Rebel commanders in Aleppo say they are stockpiling goods as aid groups step up food deliveries—crates of lentils, rice, ketchup and baby formula—seeking to prevent the same kind of mass starvation that forced them to surrender the much smaller city of Homs in May. Losing Homs, once dubbed the capital of […]