75 sorties by 65 planes (think combination of B52s, B1s, and even larger bombers) each dropping lots of dumb bombs - tonnage (some were smart, but those are used up now) would make a dent in any city of any size. Think thousands dead already, others fleeing to Iraq.
The Russians do not now nor ever have cared about civilians deaths in war, Geneva Convention or not. The key word is ‘systematically’; when they are done, there will literally be only rubble to bounce over the entire former city area.
Once again it sounds like media hype to me: merciless blanket air campaign, object of wiping the Islamic State’s Syrian center of Raqqa off the map, systematically razing the town of 200,000 inhabitants 160km east of Aleppo, When the Russians are done, the town will be a pile of rubble, an intelligence source told DEBKAfile.