Before moving to "no first use," think about Northeast Asia (Jonathan D. Pollack, Richard C. Bush III, Brookings)

Few issues are closer to President Obama’s vision of the global future than his convictions about reducing the role of nuclear weapons in U.S. national security strategy. Less than three months after entering office,in a major speech in Prague, he put forward an ambitious nuclear agenda, declaring that the United States (as the only state ever to employ nuclear weapons in warfare) had a “moral responsibility…to seek the peace and security of a world without nuclear weapons.”

http://www.brookings.edu/blogs/order-from-chaos/posts/2016/07/20-nuclear-weapons-northeast-asia-pollack-bush