The second nuclear nonproliferation conference sponsored by the Nuclear Threat Initiative and the Russian Academy of Sciences was held in Moscow, March 18-20, 2009. CISAC's Siegfried Hecker and David Holloway, with Nikolay P. Laverov of the Russian Academy of Sciences, co-chaired the conference, which was held to discuss cooperation regarding nuclear nonproliferation, arms control and disarmament. According to the organizers, the nonproliferation regime is under great strain and could take another step backward when START (Strategic Arms Reduction Treaty) expires in December 2009. Despite longstanding grievances on both sides, organizers said the conference environment reflected "cautious optimism" and that the two former superpowers may have reached a turning point in bilateral relations.