The two-day, much-ballyhooed Nuclear Security Summit (NSS) in the Netherlands, which concluded Tuesday, was politically haunted by the upheaval in Ukraine - the former Soviet republic that renounced some 1,800 of its nuclear weapons in one of the world's most successful disarmament exercises back in 1994.
A group of about 20 "eminent persons" is to be tasked with an unenviable job: convince eight recalcitrant countries to join the Comprehensive Nuclear Test Ban Treaty (CTBT).
When the United Nations commemorates the International Day Against Nuclear Tests later this week, the lingering question in the minds of most anti-nuclear activists is whether or not the existing moratorium on testing will continue to be honoured - or occasionally violated with impunity.