Everything is in-place. What event - or false-flag - will be used to trigger Actual WW3?

Just to clarify, so there is no misunderstanding . . . 

1. Armies are in forward positions.
2. Scenarios were run through computer simulations (AI to use more trendy expression).
3. Alliances were decided and consolidated.
4. Legislation was put through legal process.
5. Politicians who will run things were selected.

Everything is ready.

Now it is a matter of using an event or creating an event to start WW3.  What will be the spark that causes the explosion of war?

I guess scenarios that were run through computers did not give satisfactory results and that is a reason for delays.

But, everything is ready . . . for world war, version 3.

Ukraine was a beta test.