Mosul and Aleppo are (or were) cities of about 700K and 2.3M respectively.
After this is over how many will survive?
Does it matter -- to them it should
Russia and the USA get to test their latest weapons technology out.
Syrians get to kill each other.
Europe gets millions of Syrians knocking on its doors.
Who is winning? Nobody
Except the ones selling bullets and bombs -- they make bank.