I dont see that as a problem. Movies like: The Journey, Berlin Express and The Defector--filmed around 1947, 1947 and in the early to mid 60s--respectively--were all filmed on location.
The Journey has Yul Brynner in it as a Russian Officer and the movie was filmed in Hungary when the Russians had taken over said Country. Berlin Express w/ Robert Ryan, Charles McGraw etc--was filmed in locale in what was the American, British and Russian zones of occupation. The Defector w/ Montgomery Clift & Hardy Kruger--was also filmed mostly in the DDR.
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