A masked pro-Russian activist guards a barricade during a rally at the regional administration building that they had seized earlier in Donetsk, Ukraine, Thursday, April 10, 2014. in Donetsk, Ukraine, Thursday, April 10, 2014. Ukraine’s acting president on Thursday promised pro-Russian activists occupying government buildings in the country’s east that they will not be prosecuted if they lay down their arms, as protests continue to flare up across Ukraine’s industrial heartland. (AP Photo/Efrem Lukatsky)