Former Cuban leader Fidel Castro delivered a speech on the Iranian nuclear issue before Cuba's parliament Saturday, his first official government appearance in four years.

Former Cuban leader Fidel Castro addresses a meeting of the National Assembly in Havana, Cuba, August 7, 2010. Fidel Castro delivered a speech on the Iranian nuclear issue before Cuba's parliament Saturday, his first official government appearance in four years.[Wang Pei/Xinhua]

Dressed in an olive green military shirt without rank insignias, the 83-year-old bearded revolutionary was greeted with applause as he walked in.

Castro warned that there could be a nuclear war if U.S. President Barack Obama ordered an attack on Iran.

The special session broadcast on live television was held to debate Castro's warnings about the risks of a nuclear war.

The former Cuban leader has recently made several public appearances recently after recovering from a serious illness in 2006 that forced him to disappear from public view and later hand over the presidency to his younger brother Raul.