I think that "US interests" want to spend all the allocated money while they can, because they clip that ticket and want to be paid as much as they can be paid.  But there are other ways to embezzle and cheat the American taxpayer without also escalating a conflict against a nuclear power.

I don't think a Russian regime change makes any sense at all for the West.  Putin is one of the doves.  A regime change would escalate the war significantly.    Okay, now that I typed that out, now I understand why they want a regime change.  They want a bigger war.