Former Cuban leader Fidel Castro, who celebrates his 90th anniversary on Saturday, has published an article on occasion of his jubilee in Cubadebate portal, Gazeta.ru reports.

In the column, Castro shared with the memories of his childhood, mentioning that “the unavailability to education can be the biggest harm [for a child].”

Besides, he expressed concerns about the possibility of using nuclear weapon in the world.

Castro also expressed regret with the fact that during his visit to Hiroshima, the U.S. President Barack Obama didn’t apologize for the atomic bombs dropped on the Japanese cities in 1945.

“It is necessary to again and again repeat about the necessity to maintain peace. It is also necessary to speak about the truth that no superpower has the right to kill millions of people,” the revolutionary noted.