Germany when ? During the 10s and 20s? This isnt Stalin's policy vs Trotsky's policy. Trotsky was there and backed the party's foreign policy approach on those issues ?

In the 30s?

The amount of soviet involvement required in Germany during the 30s to have the communists come out on top (especially since most of the SDP was anti communist and non cooperative to its core) would be paramount to starting a full scale civil war there and then being forced to directly being involved military wise for the german communists in a open proxy war against the liberal/right wing side that would be backed by the entirety of global capital while you are…the USSR of the 30s. At a point where the USSR couldnt project that kind of power let alone defend from it and a failure of that attempt would leave them extremely weak. The industrialization, militarization , modernization etc wherent even halfway done. Chosing what would logicaly lead to open proxy war in germany and spain during the state of development and organization they were in the 30s would be paramount to suicide imo with an extremely high chance of those countries NOT turning red, USSR invaded by the subsequent fascism while in a much worse position or just not achieving the objectives in spain and germany and collapsing internaly much earlier and never having even an "eastern bloc" allied to them