What does " real drive" mean in this sentences?

After its receipt he predicted German operations in the Balkans as a prelude to the “real drive” on Russia. The war would then come to a climax in an “ocean of anarchy and bloodshed.”

User2020-02-29T15:17:35Z

"Real" as opposed to "expeditionary" or "exploratory".
I.e. the REAL, FULL effort made to assault Russia.