Former Cuban leader Fidel Castro speaks on Cuban television in Havana July 12, 2010. Castro, who has lived in seclusion since falling ill four years ago, appeared on Cuban television and radio on Monday evening to discuss his theory that the world is on the verge of nuclear war. The appearance marks the second time in less than a week that the suddenly resurgent 83-year-old has made a public appearance, after staying out of view, except in occasional photographs and videos, since undergoing emergency intestinal surgery in July 2006. REUTERS/Alex Castro (CUBA – Tags: POLITICS) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS