Estonian President Toomas Hendrik Ilves (left), with intelligence officer Eston Kohver in 2010. Kohver was arrested by Russian police on spying charges, but Estonian officials called it an illegal kidnapping. AP hide caption

itoggle caption AP

A column of Russian troops prepares to leave the checkpoint at a bridge over the Inguri River in Western Georgia, in October 2008, after securing the secession of Georgia's breakaway South Ossetia region. Levan Gabechava/Reuters/Landov hide caption

itoggle caption Levan Gabechava/Reuters/Landov

Residents of the Estonian capital of Tallinn can use public transportation for free after purchasing a special card for 2 euros. Raigo Pajula/AFP/Getty Images hide caption

itoggle caption Raigo Pajula/AFP/Getty Images