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This year marks the 50th anniversary of the Cuban Missile Crisis, when the United States and the Soviet Union walked back from the brink of a nuclear war.

In this Nuclear Notebook, the authors write about nonstrategic nuclear weapons—starting with the difficulty of finding a universal definition for them. Although the United States and Russia have reduced their nonstrategic stockpiles, significant inventories remain.

In the wake of the disaster at the Fukushima Daiichi Nuclear Power Station, opinion makers and policy makers, alike, have worked internationally to pique interest in thorium as a possible alternative fuel for commercial nuclear reactors.

In April 2012, India successfully test-launched the Agni V ballistic missile—and though the missile needs more testing and is still several years away from operational deployment, the Agni V introduces a new dynamic to the already complex triangular security relationship among India, Pakistan, a