Why do you think that? If it's a bluff, it's taking a long time, with a lot of actions edging closer to war.
Again, to me, this is the definition of bluff. It's literally in your sentence "_false_ flag bombs"
https://www.vice.com/en/article/dypwvy/ukraine-oligarchs-fle...
If it's a bluff, it's a bloody good one.