MOSCOW (Reuters) - Belarusian opposition politician Maxim Znak declared a hunger strike in jail on Friday after being charged with calling for actions that could harm Belarusian national interests, the opposition Coordination Council said. Znak is a member of the council and a prominent leader of protests demanding the resignation of President Alexander Lukashenko following an Aug. 9 presidential election that the opposition says was rigged. Lukashenko denies vote-rigging.