From the Kazakhstani article:
According to the leaked information obtained by the edition of The Moscow Times, a meeting between Vladimir Putin and Turkish Ambassador was characterized by strong mutual resentment.
Ambassador Umit Erdim rejected all accusations and blamed Russia for a brutal and protracted civil war in Syria. “Then tell your dictator president he can go to hell along with his ISIS terrorist and I shall make Syria to nothing but a ‘Big Stalingrad’, for Erdogan and his Saudi allies are no vicious than Adolf Hitler,” said Putin during the 2-hour meeting with the Turkish emissary behind closed doors.
“How hypocrite is your president as he advocates democracy and lambaste the military coup d’etat in Egypt and he simultaneously condones all terrorist activities aimed to overthrow Syrian president!” Putin said.”
I think the “Big Stalingrad” refers to what Stalingrad looked like at the end of the siege ... ie reducing Turkey to rubble.
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You can see when Previewing your comment that punctuation changes from straight to curly, thus mucking up and making it difficult to read. This has been going on so long ... too long.
I think, if the quote is real, it’s a metaphor for a massive and humiliating defeat. Like we would talk about a sneak attack as a Pearl Harbor or final defeat as a Waterloo.