What are the criteria for “joining” the PSI (i.e., can states outside nonproliferation regimes join)?
The PSI is not an organization that has “members.” It is an activity under which countries around the world will cooperate and coordinate more closely on efforts to prevent shipments of WMD, delivery systems, and related materials. The U.S. welcomes the support of all states for the PSI, particularly flag, coastal, or transshipment states, or those likely to have suspect flights in their airspace, that may have an especially important role to play in preventing such shipments.
