Atomic bombing survivor and peace advocate Setsuko Thurlow on Tuesday called for more countries to join a nuclear ban treaty so that the U.N.-adopted pact can enter into force at an early date.

In an online gathering hosted by Japanese nongovernmental organization Peace Boat, Thurlow, who survived the 1945 U.S. atomic bombing of Hiroshima at age 13, shared a vision of denuclearization and disarmament so as to prevent further tragedies.

"That massive killing of human beings — it is not acceptable behavior, it's totally illegal, and that's something we can avoid," Thurlow said. "Our resources should be to enrich human life, not to destroy our lives."