Was there any Russians or Ukranians fighting side by side with the 6th Army in the kessel?

Question

What are Hiwis?

Answer 1

By late 1942, the German army was so far under-strength in real terms, that many units did whatever they could on an informal basis to fill gaps by using Russians, Ukrainians, etc. as helpers.

That's exactly what "Hiwis" were: volunteers, usually from prisoners of war, undertaking rear echelon and baggage work as general laborers, transport drivers and grooms. The term "Hiwi" is an abbreviation for "Hilfswilliger", meaning "voluntary assistant".

The fact that Hiwis volunteered doesn't necessarily mean that they were enthusiastic about Germany's cause, although many Ukrainians certainly were. But, for most Hiwis, the decision to volunteer to work for the Wehrmacht was probably based simply on the choice of starving to death in a German POW camp, versus getting something to eat as an unarmed "gofer" in the German service.

At Stalingrad, however, when matters became desperate for 6th Army, Hiwis were given arms and fought alongside the German troops. In most cases, this probably was also a voluntary action. Having experience of the Soviet system, the Hiwis knew that they could expect no mercy if they were captured by the Red Army, so they might as well go down fighting.

But they were not formed into separate fighting units within 6th Army. They were simply used as replacements in existing 6th Army units.

It is highly unlikely that any of them survived for long following the capitulation.

Answer 2

As well as WH units, the SS also formed foreign divisions. (Photos of arabic SS officers sporting a fez. Weird).

The SS formed Ukranian and Russian divisions, although the Russian unit was dipanded at the request of the other SS divisions, for being too violent.

You might want to try out the following in order to answer the question:

Osprey: The SS
Osprey: The 6th Panzer Armee

Luck