WI: Soviet Union ruled by a Polish or German Communist instead of Stalin

What if in the place of Stalin, the Soviet Union had instead been ruled by a Polish or German communist leader, either Jewish or non-Jewish. How would that change the Soviet Union's foreign policy?
 
I am not sure if you could get a purely Polish or German communist into a leading position but somebody who fulfills almost all your criteria Polish/German/Jewish Communist and close to the circles of power would be Karl Radek.

Karl Radek

Karl Berngardovich Radek (31 October 1885 – 19 May 1939) was a Marxist active in the Polish and German social democratic movements before World War I and an international Communist leader in the Soviet Union after the Russian Revolution. Radek was born in Lemberg, Austria-Hungary, as Karol Sobelsohn, to a Litvak family. After the outbreak of World War I Radek moved to Switzerland where he worked as a liaison between Lenin and the Bremen Left, with which he had close links from his time in Germany, introducing him to Paul Levi at this time. He took part in the Zimmerwald Conference in 1915, siding with the left. In 1917 Radek was one of the passengers on the sealed train that carried Lenin and other Russian revolutionaries through Germany after the February Revolution in Russia.
https://en.wikipedia.org/wiki/Karl_Radek
 
Really don't think you're going to get a foreign national as the head of the USSR.

I read OP´s question in the sense, that an ethnic German in the USSR (previous Russian Empire) (a Volga German for example) or Polish become head of the USSR/Communist Party General Secretary. Stalin was a Georgian after all. The early USSR loathed Nationalism as reactionary (even Russian nationalism). We could theoretically see an Armenian, Finnish, Baltic, Central Asian, Tatar or Chinese head of the Soviet Union as well (any plausible candidates) ? Lenin also had Tatar ancestors.
 
I read OP´s question in the sense, that an ethnic German in the USSR (previous Russian Empire) (a Volga German for example) or Polish become head of the USSR/Communist Party General Secretary. Stalin was a Georgian after all. The early USSR loathed Nationalism as reactionary (even Russian nationalism). We could theoretically see an Armenian, Finnish, Baltic, Central Asian, Tatar or Chinese head of the Soviet Union as well (any plausible candidates) ? Lenin also had Tatar ancestors.
Ah. OP didn't say Polish or German origin, but you're right, this does make sense.
 
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