The whole objective of the British and French and any alliance with the SU was to avoid a war not start one.
This thread is about whether USSR would have invaded Germany if Barbarossa didn't happen. I don't think they ever had specific plans, let alone issuing of warning orders, staging, etc. But its pretty clear they considered Germany threat enough in 1938 that they broached that alliance in the first place.
Likes: Futurist and tomar