One year after the signing of a provisional peace deal in Washington, DC, American, Armenian, and Azerbaijani officials continue to exude optimism about the potential for stability and prosperity in the South Caucasus. But movement toward implementing the joint declaration has been halting. On August 8, the one-year anniversary of the declaration’s signing by Armenian Prime Minister Nikol Pashinyan and Azerbaijani leader Ilham Aliyev, US Secretary of State Marco Rubio issued a statement reaffirming Washington’s commitment…