HAVANA (Reuters) – Cuban revolutionary leader Fidel Castro took his warning of impending nuclear war to Cuba's Foreign Ministry on Friday, where he explained the reasons for his dire prediction in his fifth public appearance in 10 days.

His latest outing was reported on state-run website http://www.cubadebate.cu, which said he met with Cuban ambassadors at the ministry in Havana and that a videotape of the session would be shown on Friday evening on national television.

It said Castro, 83, talked with the ambassadors for 1-1/2 hours, during which he showed them news reports and political analyses that were the basis of his prediction. He also fielded questions, the report said.

Foreign Ministry employees and people from the surrounding neighborhood gave him a spontaneous send-off with a "prolonged ovation and emotional (shouts of) 'Viva'" as he left, it said.

Castro disappeared from public view following emergency intestinal surgery in July 2006 and ceded power to his younger brother, now President Raul Castro.

He resurfaced on July 7 at a scientific research center in Havana and has since made several appearances in person and in a videotaped television interview.