End of Turn 42 and the pocket is now almost sealed off.
I had a total disaster down south when my garrison of Melitopol surrendered! Just when I was starting to stage a spirited defence.
End of Turn 43 and the pocket is shrinking, aided by some futile attempts to break out (actually to meet mandatory attacks and deny the Axis some Victory Points).
Kharkov is the next Soviet bastion.
After that it is the Donets' basin.
The weather is still fine, but that can't last forever. The Axis are also approaching the limits of their supply lines. Plus some of their units are scheduled to be withdrawn.