On june 1941 from C Pleshakovīs "Stalinīs folly":
Radio transmitters remained scarce for the Red Army. The Baltic military district had just 52% of the required number, the Kiev Military district 30% and the Western MD 27%.
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As we know Stalin did not get information on what was happening ( nor could respond to fast changes ) and this definitely can be said to be due to poor radio contact between the two, I think.
Also: " In May 1941, Soviet border Guards captured 353 men trying to cross the border, in the first ten days of June 108."
Which means many agents who got over and destroyed the usual means of communication, the telephone cables, just before the Barbarossa begun.
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