| 英文摘要 |
Since the dissolution of Soviet Union and the independence of Ukraine, people did not have a consistent view over the future development of the country. At domestic level, the pro-European and pro-Russian people were in diametric opposition, while at the international level, the Western countries were in diplomatic wrestling together with the struggling of the Eastern separatists. It was actually a demonstration protesting against the government for suspending the talk with the European Union, but later it turned into the Crimean status referendum to separate from Ukraine and to join the Russian Federation. Yanukovych did meet the opposition's requirements at that moment, yet he was later ousted by the Congress. For a long time, Ukraine has been in the middle of the two giants, Russia and the European Union, resulting in the Eastern ''pro-Russian'' part and Western ''pro-European'' part. Even the country's political parties and the people could not reach a unified opinion on their foreign policy. Currently, the Ukrainian politics of ''semi-presidentialism'' tends to be a zero-sum game leading towards the political division and polarization of the east and the west. To avoid political division and to keep a stable operation of the democracy, it is not enough to depend on the domestic political system as it cannot effectively solve the problem. The main reason that has caused the Ukrainian political turmoil has always been the zero-sum competition of Russia and the European Union at the post-Soviet space within the international environment. |