No boots on the ground usually does that. Trump telling Iranians this might be their only chance to take over their government was him saying “we’re not going in, this is the best we’ll give you”.
I mean yeah, deploying troops usually assures an ascendancy of some sort for new leadership. I’m sure they’ve probably got CIA on the ground, but this becomes a power vacuum very quickly. This is a larger move against Russia that I can’t really comprehend how it even happened.