John Kerry said Thursday the United States would negotiate with Iran only if it proved it would not pursue a nuclear weapons program.
Following a meeting Thursday with Japanese defense and foreign ministers, and U.S. Secretary of Defense Chuck Hagel in Tokyo, Kerry said his "hope is that there is a way forward" with Iran.
"Nothing we do is going to be based on trust. It's going to be based on steps," he said. "A country that generally wants to have a peaceful program does not have difficulty proving that it's peaceful."