]]>“At a time when tensions with Moscow are on the rise, the Open Skies Treaty serves as a very useful tool for the United States and our allies to monitor Russian military activities,” former Secretary of State George Shultz, former Defense Secretary William Perry and former Sen. Sam Nunn (D-Ga.) wrote in a memo to the Trump administration released by the Nuclear Threat Initiative this week. “Unilateral U.S. withdrawal from Open Skies would undermine American allies and friends in Europe.”