Opinion: Strife in Ukraine is Europe's most daunting problem

In spring 2014, Ukrainian president Viktor Yanukovych fled from Kyiv and resurfaced in Russia. His departure followed three months of mass protests termed “Euromaidan,” denoting Ukraine’s quest to sign an association agreement with the European Union.
In response, Russian president Vladimir Putin authorized an invasion of Crimea from Russian naval bases and the mainland, initially led by troops without insignia dubbed by locals “the little green men.” The occupation