Portside

"Believers of proactive nuclear deterrence, who say nuclear weapons are indispensable to maintain peace, are only delaying the progress toward nuclear disarmament," Hiroshima's governor added.

The New START treaty is the last remaining deal limiting US and Russia nuclear weapons as Trump withdrew from two others.

The U.S. has pulled out of a major arms agreement with Russia, and the Trump administration wants to bump the budget for the modernization of nuclear weapons by nearly 9 percent. The nuclear powers should observe the Nuclear Non-Proliferation Treaty