Ukraine's government has also had to honor a regional vote in Donbass and Luhansk, but they have yet to do that. As it is, at least one state in East Ukraine is now using the ruble instead of the Ukrainian hryvnia. The most famous U.S. vs Russia proxy war was the war in Afghanistan in the late 1970s and early 1980s. All hell broke loose between Russia and Ukraine after the 2014 so-called "Euromaidan" protest against president Viktor Yanukovych. Europeans have been brought on board to mediate the ongoing, bitter divorce between Russia and Ukraine, now heading into its fourth year.

Source: Forbes December 24, 2017 14:48 UTC