SEVASTOPOL, UKRAINE - MARCH 19: Crimean "self-defense" forces block entrance to the Navy Headquarters in the Black Sea port of Sevastopol 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)