Graham Allison, director, Belfer Center for Science and International Affairs and Douglas Dillon Professor of Government at Harvard’s John F. Kennedy School of Government.

What’s the good news about Ukraine?  No nukes. 

Unlike 1993, when 2,000 strategic nuclear weapons sat atop intercontinental ballistic missiles aimed at targets in America, today Ukraine has zero nuclear weapons. 

Unlike 2010, when 15 nuclear weapons-worth of highly enriched uranium remained at risk in Ukraine, today Ukraine is nuclear weapons material-free.

The strategies and actions that produced a nuclear-free Ukraine—including the Nunn Lugar Cooperative Threat Reduction Program that provided wherewithal for the former, and the Nuclear Security Summits that provided an action-forcing process for the latter—offer clues for the Obama administration to consider as it marches to the third Nuclear Security Summit in the Hague on March 24.