Matrix Games have put up a Google Earth file for free download ahead of their soon-to-be-released 'Panzer Command:Kharkov' game.
The file is a neat historical program in its own right..
Download instructions are here -
http://www.matrixgames.com/
I did these few sample screenshots, (greyed-out area is German territory)
1 - Attacking from right to left, the Russians punch a huge salient in the German line south of Kharkov..
2 - The Germans attack from north and south to pinch off the neck..
3 - A Russian attempt to relieve the pocket is checked by 14th Pz Div..
4 -The tips of the arrows collide on one of the game scenario maps at Chepel..