HAVANA, CUBA (BNO NEWS) -- Former Cuban leader Fidel Castro on Friday made a public appearance for the first time in 4 years in a 45-minute speech at a university in Havana, Cuba.

Dressed in his characteristic military olive green, although without the insignia of military rank, Castro spoke to mainly university students at the University of Havana, repetitively warning of nuclear warfare, which have been a common in theme in his previous speeches.

"It is well known and I have no choice but to recall the fact that we are not living the days of chivalry," Castro said, referring to the destructive power of modern weapons of war. "Humanity has little time to free itself from [nuclear war]."

"Peace is paid with peace," he stated. "If you want peace, prepare yourself to change your conscious," reminding the public that the U.S. was the first county to use nuclear weapons, bombing Hiroshima and Nagasaki during World War II.

"The world never imagined the appalling use of two nuclear weapons at the end of World War II, but the power of the current existing weapons multiplies their power," Castro stated, underlining the consequences of the 1945 bombings, which persisted for years.

Even though the world is largely aware of the situation, Castro called on nations around the world to continue freeing itself from nuclear warfare.

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