Fair enough. And here's Nuland's conversation, which was reported at the time (
BBC).
My take on the leaked Nuland conversation from 2014 is, for what it's worth, that the US anticipated the possibility of a change of government, and wanted it to be democratic and stable. In the leaked conversation, they said "we want to keep the moderate democrats together." That seems to have been the aim.
Given the aim, the US was looking to broker an agreement between the relevant opposition leaders as to who would be Prime Minister in a kind of Government of National Unity with all three moderate democratic leaders involved. Nuland suggested that Arseniy Yatseniuk had the experience, and that if Vitaly Klitschko (then mayor of Kyiv) tried to do it, he would essentially be deferring to Yatseniuk anyway. So, they were hoping to get Yatseniuk as nominal leader, to agree to work closely alongside Klitschko and Eloh Tyahnybok.
The rest of the conversation is about trying to confer authority on this arrangement. "I think we've got to do something to make it stick together because you can be pretty sure that if it does start to gain altitude, that the Russians will be working behind the scenes to try to torpedo it."
"we could land jelly side up on this one if we move fast."
So, it's fishy in the sense that the US was trying to guarantee a stable transition of power. Which to my way of thinking is just pragmatic statecraft.