Reading this story is somewhat perplexing. I understand the spread of Polio in places that the virus exists, and how the social and political climate affects the level of protected individuals. When they bring up Ukraine, however, I am a bit confused. Has Polio been reported there, in the drinking water?
A quick google search turns up this helpful article: http://www.reuters.com/article/2013/11/15/us-ukraine-polio-idUSBRE9AE0LJ20131115
In this article, it is spelled out more clearly: low vaccination rates in the middle east contribute to the rising rates. With lower levels of trust in the government, Ukraine's citizens are vaccinated on a lower level, and so are vulnerable to travelers from the mideast.