Originally Posted by BullMcGiveny
Problem is, at the time Zola was in SSR custody. It makes more sense if the Americans had him, especially since he was the only one who had worked with the Tesseract before.
Of course, it could be that the US swapped Zola for someone else.
Or here's a thought. The US swaps Zola for Bucky Barnes, only Bucky is already brainwashed and so he assassinates Chester Philips and runs away back to the USSR.
But I thought that Col. Phillips and SSR were going to give him amnesty in like Switzerland if he gave any information on Red Skull's plans. If they did do this, then it's entirely feasible that Zola could have found his way into working for the Soviets.