Russia’s national interest requires that Ukraine never come under the full sway and influence of the European powers. Ukraine has been part of the Russian sphere of influence for more than 350 years, and this reality has contributed greatly to the country’s sense of security. The geography of Russia—vulnerable to attack through lands devoid of natural protective barriers—gives it a sense of vulnerability that has been, for centuries, uppermost in the minds of its leaders and populace. The result is a need to control surrounding territory as a hedge against that inherent vulnerability. Ukraine has been part of this strategic concern for centuries.