HAVANA  - Retired Cuban leader Fidel Castro made a rare public appearance on Sunday as he took his long-empty seat beside brother Raul Castro at the opening session of the National Assembly, the official National Information Agency reported. Fidel Castro has graced the assembly chambers just once, in 2010, since taking ill in 2006 and ceding power to his brother. In that appearance, he delivered a brief speech warning that a US confrontation with Iran could lead to a nuclear holocaust. A frail and stooped Castro, 86, also appeared in public earlier this month to vote for the National Assembly and chat with Cuban reporters.