Conversation so far:
what happened to eastern europe as a result of world war i
In the immediate aftermath of WWI, defeat drove cooperation between Germany and the Soviet Union but ultimately these two powers would compete to dominate eastern Europe.
how are relations between germany and russia today
Germany–Russia relations display cyclical patterns, moving back and forth from cooperation and alliance to strain and to total warfare.

Question: when were the countries friendly
Self-contained rewrite: when were germany and russia friendly