Havana, Cuba (CNN) -- Former Cuban leader Fidel Castro ended a long writing hiatus Monday, penning a three-page essay printed in state media slamming U.S. President Barack Obama's speech to the United Nations last week.
"Who understands the gibberish of the President of the United States speaking before the United Nations?" Castro wrote in his so-called "Reflection."
He also accused NATO of "monstrous crimes" in Libya and wrote that in Syria, "Yankee aggression could lead to an even more terrifying massacre than in Libya."
It was Castro's first Reflection in almost three months. The 85-year-old former leader has been largely out of view and silent for the last couple of months, fueling renewed speculation about a downturn in his health. His younger brother, Raul Castro, assumed the presidency in 2008 after Fidel Castro had emergency surgery.
Fidel Castro gave an interview to an anchor from Venezuelan state TV earlier this month, but only the audio was broadcast.
He said in the essay his writing would be continued "tomorrow."