U.S. President Barack Obama recently spoke in Prague, saying ". . . as the only nuclear power to have used a nuclear weapon, the United States has a moral responsibility to act. We cannot succeed in this endeavor alone, but we can lead it, we can start it. So today I state clearly and with conviction America's commitment to seek the peace and security of a world without nuclear weapons."
I welcome and support Obama's historic statement. However, I would like to ask him very strongly to start working together with Hiroshima and Nagasaki — the only cities to suffer atomic bombings. Then the United States could really lead the effort and the world could recognize that its actions are based on true, moral responsibility.
Every world leader should be aware that the Earth could be destroyed by a nuclear war. Therefore, they must choose "coexisting or co-perishing" before making any decision to use a weapon of mass destruction since the decision is directly linked with the fate of our planet.