A worker at a Ukrainian gas station in Volovets, Ukraine, Oct. 7, 2015 (AP file photo by Pavlo Palamarchuk).

The current crisis between Russia and Ukraine has put the United States and its European allies on high alert over the possibility of the first major interstate military conflict in Europe since World War II. Although efforts to find a diplomatic resolution to the crisis continue, the room for a mutually acceptable outcome has narrowed now that the U.S. and NATO have rejected Russia's demands that no additional NATO troops be deployed to Eastern Europe, while continuing to provide arms and other aid to Ukraine. Apart from the concerns the crisis has raised over European security and Russian revanchism, Europe […]