The Soviets did not need the Volksarmee and did not trust the East Germans . US need the Bundeswehr but did not trust the West Germans .
That's why Hans Speidel was the NATO commander of all ground forces in the CENTCOM between 1957-1963. NATO and the US didn't trust him. The Soviets needed the GDR to be faithful to communism even if they didn't trust them. That's why they used former wehrmacht officers and former nazi police officers to establish the East German security police (Stasi)