I don't buy that argument.
After 1924 - the end the civil war, Estonia, Latvia, Lithuania, Belorussia(?), Moldavia, Georgia, the Ukraine, Armenia, Azerbaijan, Turkmen, Kazakh, Uzbek, Tajik, Kyrgyz, etc., were defeated. There was no longer any threat that these "countries"/Soviet Socialist Republics were bases of anti-soviet or Turkish imperial activity.
Those were the excuses that Stalin used, along with "nationalist kulaks" to justify/excuse his repression.
In the Interwar Period, the people living in Finland, Poland, Estonia, Latvia, Lithuania and the Rumanian part of Moldavia were quite happy where they were.
As far as I know, there weren't any credible, and certainly not successful, attempts to undermine communism in the Soviet Union either by these peoples or by foreign intelligence operations launched from these countries. Any such accounts are Stalinist GPU propaganda or the stuff of Western pre Bondian Reily "Ace of Spies" fiction.
What goes on in the former Soviet Union/CIS is their business.
Not that of the U.S., the Pentagon, the CIA, the State Department, George Soros or NATO, etc.