By Daryl G. Kimball and Kelsey Davenport (updated 12:00 noon EST)
Today in Vienna as P5+1 negotiators engage with their Iranian counterparts on each side's proposals for a "comprehensive solution that would ensure Iran's nuclear programme will be exclusively peaceful," it is clear that the two sides are still far apart on the pivotal issue of Iran's "practical needs" for uranium enrichment.
By Greg Thielmann
(Image source: Globalzero.org)
The following are some of the key arms control dates and developments to watch in the coming week. 
USS Monterey armed with SM-3 Block IA interceptors and the Aegis missile defense system. The SM-3 cannot intercept Russian long-range missiles.
The following are some of the key arms control dates and developments to watch in the coming week.
The following are some of the key arms control dates and developments to watch in the coming week.
The following are some of the key arms control dates and developments to watch in the coming week.
The following are some of the key arms control dates and developments to watch in the coming week.
By Greg Thielmann
The latest data on strategic weapons exchanged between Russia and the United States under terms of the 2010 New Strategic Arms Reduction Treaty (New START) shows movement by both countries toward the three key limits of the treaty. In spite of bilateral tensions over events in Ukraine, these data from the beginning of March and the fact that subsequent on-site inspections continue suggest that treaty implementation is still on track.
The following are some of the key arms control dates and developments to watch in the coming week.
