STRATFOR (that "American global intelligence company" whose internal emails got leaked on Wikileaks about 2 years ago) posted an interesting analysis on the Ukraine protests a few weeks ago. It contains a somewhat good overview of what motives drive the various parties (U.S.A., Russia, EU, Germany) in the current conflict in Ukraine.
http://www.stratfor.com/weekly/perspectives-ukrainian-protests
Since nobody here will follow the link anyway, I'll just post what might be considered the conclusion of their analysis:
As in most matters, it is important to understand where the United States fits in, if at all. Washington strongly supported the Orange Revolution, creating a major rift with Russia. The current policy of avoiding unnecessary involvement in Eurasian conflicts would suggest that the United States would stay out of Ukraine. But Russian behavior in the Snowden affair has angered Washington and opened the possibility that the United States might be happy to create some problems for Moscow ahead of the Sochi Olympics. The U.S. government may not be supporting nongovernmental organizations as much as its counterparts in Europe are, but it is still involved somewhat. In fact, Washington may even have enjoyed putting Russia on the defensive after having been put on the defensive by Russia in recent months.
In any case, the stakes are high in Ukraine. The Russians are involved in a game they cannot afford to lose. There are several ways for them to win it. They only need to make the EU opening untenable for the Ukrainians, something Ukraine's economic and social conditions facilitate. The Europeans are not going to be surging into Ukraine anytime soon, and while Poland would prefer that Ukraine remain neutral, Warsaw does not necessarily need a pro-Western Ukraine. The United States is interested in Ukraine as an irritant to Russia but is unwilling to take serious risks.
A lot of countries have an interest in Ukraine, none more so than Russia. But for all the noise in Kiev and other cities, the outcome is unlikely to generate a definitive geopolitical shift in Ukraine. It does, however, provide an excellent example of how political unrest in a strategically critical country can affect the international system as a whole.
In most countries, the events in Kiev would not have generated global interest. When you are a country like Ukraine, even nominal instability generates not only interest but also pressure and even intervention from all directions. This has been the historical problem of Ukraine. It is a country in an important location, and the pressures on it tend to magnify any internal conflicts until they destabilize the country in excess of the significance of the internal issues. Germany and the United States may continue to pursue goals that will further irritate Russia, but as Stratfor indicated in our 2014 annual forecast, they will avoid actions that would risk harming Moscow's ties with Washington and Berlin. Russian influence in Ukraine is currently being limited by the proximity of the Olympics and the escalation in protests on the ground, but the fundamental geopolitical reality is that no country has a higher stake in Ukraine than Russia, nor a better ability to shape its fate.
