LONDON (Reuters) – Russia and Ukraine on Friday accused each other of shelling the Zaporizhzhia nuclear power plant, the biggest of its kind in Europe, and laying the ground for a potential disaster. Russia’s defence ministry said it was only by luck that a radiation accident had been avoided after what it described as an artillery barrage. Ukrainian President Volodymyr Zelenskiy though said Moscow was responsible and accused it of committing “an open, brazen crime, an act of terror”. In a late night address he demanded sanctions on the entire Russian nuclear industry. “It is a purely a securi…