Usually I do not have the habbit to comment conspiracy theories, and have no intention to start.Stalin could have saved all Russian soldiers. But his bad habit of putting suspicion on everyone got thousands of Russian soldiers killed. A simple 5 men contingent to Belin was sufficient to save all Russians. I mean Hitler was also aware of the situation, and he was also a human. But Stalin always suspected Hitler and from his actions, he signaled Berlin that we are not friends.