SEVASTOPOL, UKRAINE – MARCH 19: Armed soldiers without identifying insignia guard entrance to the Ukrainian Navy Headquarters building on March 19, 2014 in Sevastopol, Ukraine. Crimean self-defense forces stormed the Ukrainian Navy Headquarters, base A-0225, a day after Russian President Vladimir Putin signed a treaty with Crimean leaders to annex the region. (Photo by Oleg Klimov/Epsilon/Getty Images)