HAVANA – A relaxed, lucid Fidel Castro returned to the limelight Monday after years spent largely out of public view, discussing world events in a raspy voice in his most prominent TV interview since falling seriously ill four years ago.

The 83-year-old former president talked about how tension between the United States and both North Korea and Iran could ultimately trigger a global nuclear war in an interview on “Mesa Redondo” — or “Round Table” — a daily Cuban talk show on current events.

The revolutionary leader took questions at a desk in a sparsely decorated office at an undisclosed location. It was not immediately clear if the broadcast was live, but Castro referred to a July 5 article as having been published six days ago, which would mean the show was taped Sunday.

Later, however, the program’s host read from an essay published Sunday evening, referring to it as having come out “last night.”

Castro warned that an attack on Iran would be catastrophic for America.

“The worst (for America) is the resistance they will face there, which they didn’t face in Iraq,” he said.

As the interview progressed, Castro at times showed flashes of his prowess as a powerful speaker. At other points, however, he paused for lengthy periods and shuffled pages in notes he kept in front of him.

The former Cuban leader has shunned the spotlight since undergoing emergency intestinal surgery in July 2006. The illness forced him to step down — first temporarily, and later permanently — and cede power to his younger brother Raul. His recovery has been a closely held state secret, and his health has been the subject of persistent rumors among exiles in Florida.

Castro’s sudden re-emergence comes after the dramatic announcement last week that Cuba will free 52 political prisoners in the next few months under a deal with the Roman Catholic Church. The former Cuban leader made no mention of the deal, focusing instead on world events and repeating points he has made in recent essays.

Castro remains head of Cuba’s Communist Party and continues to publish his thoughts on international events in opinion pieces called Reflections.

While Cubans have become accustomed to reading Castro’s writings, he has stayed largely out of the public eye since ceding power, helping Raul Castro solidify his place as the country’s leader after a lifetime spent in his brother’s shadow.

Monday’s highly anticipated interview was announced in a front-page story in the Communist Party daily Granma earlier in the day. Castro has appeared in videotaped interviews with Cuban television in 2007.

Photos of the elder Castro greeting workers at a science center were published in pro-government blogs and on state media over the weekend, the first time he has been photographed in public since his illness.

Cubans reacted with surprise to word of Castro’s relative media blitz.

“I think it will have a positive effect on people,” said 21-year-old student David Suarez. “It will give hope that once again he will help to solve our problems.”

Magaly Delgado Rojo, 72, a retiree in Havana’s Playa neighborhood, said the appearances must have been carefully thought out by Cuban leadership.

“The photos (published over the weekend) and now the Round Table are meant to send a message: ‘I am here, and I am on top of everything I am a part of every decision that is being made,’” she said.