This trope will not die.
No, the CIA did not overthrow the Yanukovich government, nor was there a coup. Yanukovich and his party's parliamentary bosses literally fled the country, but they did so because the riot police who had been dealing with the crowd protests abandoned their posts, because the riot police (rightfully so, in my view) believed that any violence ordered against protesters would be pinned on them by the government, as had already been the case. The deal in place with the opposition was likely to be held up; only a small number of Rada deputies from the minor radical parties present were calling for actual revolution, and in fact, the opposition was caught completely off guard by the abandonment of the country by Yanukovich, which is why it took them so long to initiate removal from office proceedings after it was clear he was gone, and why setting up the new government was a complete and utter mess.
This was not tanks rolling down the streets and the army getting on the radio and telling people that a government of national unity was in place and that martial law was in effect. That is a coup. This was a panicked flight from an explosive crowd control situation by a government that knew its legitimacy was seriously in question. Power was not overthrown in the manner of a revolution; it was crammed into a vacuum. There was a deal in place, that was agreed to, with mediation from both the Party of Regions, the Parliamentary Opposition, and the EU. What really happened was a failure of nerve.
The Yanukovich government mishandled crowd control in such a way that the REAL powerbrokers in Ukrainian society, the corrupt middle managers and minor oligarchs, decided that his exit was going to be a permanent one, and his party lost its sanction to rule. It is true, however, that the prospect of EU Development funds was WAY more enticing than being a member of the Eurasian Union for this group, with the exception of the ones in the petroleum industry, which explains the breakdown of who went into Russia in March 2014 and who didn't. EU Development funds, as Romania and Bulgaria have shown, provide an extravagant feast for corrupt middle managers and minor oligarchs.
The presence of State Department officials and past-their-prime Senators in Kiev proves nothing other than that they wanted a front row seat, as the US State Department quite frankly is not competent enough to pull off a coup of that nature. The domestic forces in play were not something that foreign intelligence agencies and diplomatic corps had much sway with. And really, the US State Department and the CIA are far less influential in Eastern Europe than EU representatives on mission are. Security guarantees that are never going to be backed up for non-NATO countries are worth a lot less than the EU developmental fund offers being waved around.
Why the idea that "American spies overthrew the Ukrainian government" keeps getting perpetuated is something that just confuses me to no end.