Former Cuban President Fidel Catsro says that any military action against Iran will trigger a nuclear war that will put an end to humanity.
"The use of nuclear weapons in a new war would mean the end of humanity," he stated in the four-minute video.
The former Cuban leader also called on world powers to eliminate all nuclear weapons.
"Let us have the courage to proclaim that all nuclear or conventional weapons, everything that is used to make war, must disappear," Castro said.
The 84-year-old Cuban revolutionary leader ceded power to his younger brother Raul in 2008.
Israel, which is the only possessor of nuclear arms in the Middle East, has repeatedly voiced its determination to end Iran's nuclear program, even through military means.
Unlike Israel, Iran is a signatory to the Nuclear Non-Proliferation Treaty and has repeatedly said that its nuclear program is peaceful.