The idea of Soviet aerial supply of a pocket containing perhaps 400,000 men to 600,000 men [or however many the Kursk salient contained in late March and early April] in the immediate aftermath of 3rd Kharkov, is almost laughable.
It is rather unlikely the Germans could close the pincers fast enough to capture 400,000 men, and even if they did, Kursk is a fairly short range trip from a huge number of Soviet controlled air strips. Add to that the fact that the Red Air Force was a completely different force in 43 than 41, and I think you are misguided with your sense of humour. Equally in 1943 we are talking about battle hardened well equipped and properly led Soviet troops.
The Soviets lacked sufficient aerial transport/cargo planes and they had no real experience with an air-lift to deliver large amounts of supplies.
Actually they still had quite a lot of transport aircraft and bombers that would be obsolete as bombers but useful for delivering material at night. Equally I rather doubt the Germans would have a sufficient force to ensure the ring was tight... remember the Germans are committing all its forces into an attack to encircle a small portion of the Soviet troops it thinks is there and it knows nothing of the reserve forces waiting to go onto the offensive after the German attack is blunted. In the event many of these forces had to be committed to the battle because they had mistaken the direction of the main attack and had the southern path too weakly defended and had to send reserves to support the southern defences. Their tactics of using the new tanks with their heavy armour up front with their weaker tanks behind doesn't work without the heavy front tanks so their tank forces probably would have been stopped just as quick even though the defences would have been much weaker too.
The lion's share of Germany's cargo craft were unable to keep the 6th Army supplied during the encirclement at Stalingrad.
German airfields were being captured and the Red Air Force was finding its feet and the ring included large numbers of anti aircraft guns for the dual use of stopping tanks and planes.
Also that was in winter when the weather was terrible and many days no planes could fly anyway.
They could have ignored Kursk and gone on the offensive around Rostov, or they could have waited for the Soviets to attack, or they could have attacked immediately after Kharkov...
They needed a rest, going for Rostov would have left a large Soviet force on their flank... the whole purpose of Citadel was to straighten the line as well as capture a large Soviet force and annihilate it. Without super tanks the latter was never going to happen, and even with them we saw it didn't happen either.
Another option would have been to hold in the south and center, shift forces to the north, and finish Leningrad, which would free up soldiers for deployment elsewhere.
They were in no better a state to take Leningrad as they were to take Stalingrad. Siege was the best they could manage.
I believe finishing off Leningrad would probably have required the use of Tabun and Sarin though [mind you Germany had a monopoly on these nerve agents].
And the obvious problem there is that if they did then the Soviets and the western allies would likely have started using such weapons on Berlin and other German cities... that is a door the Germans never opened for a reason.
However, several million Ukrainians and Russians did serve with the Germans either directly in front-line combat units or as auxiliaries.
Some were forced and some chose to fight for the Nazis, but that doesn't change the fact that by 1943 the Soviets had seen what the Nazis were all about and there were no illusions about their fate if they surrendered.
Once you're captured though you really cannot expect to return to the Soviet Union knowing that Stalin regards POWs as traitors to the state, so your only viable option would be to ingratiate yourself with the Germans, fight alongside them, and hope they win or at least stalemate Stalin.
Sorry, I don't think you understand. Some people do want to live at any cost and will do some outrageous things to do so, and some really don't like their current government and would join up with a foreign power to change that, but after seeing what the Nazis had done to their country... and by 1943 most front line soldiers had seen places the Germans had occupied for a while, I really don't think they would volunteer in the traditional sense... much the same as the penal battalions in the Soviet forces didn't willingly volunteer. Given a choice of charging the enemy or being shot in the back of the head... it is more of a gamble than a choice.
For what they did in World War 2 the German nation got off easy.
Worse than that, they were the first greenies... anything they could recover and use from the dead they used... including hair that was used to stuff mattresses, glasses, gold fillings, even human skin was made into leather, and bodies rendered down into soap.
I agree with TR-1 to compare the Soviet treatment of German soldiers with German treatment of Soviets is offensive.