A Russian aircraft entered U.S. airspace Monday with the intent of surveilling the U.S. as part of a legal reconnaissance mission. The Russian Tu-154M LK-1 passenger jet, which was equipped with special camera equipment, was headed to the U.S. and then to Canada for Russia's ninth and 10th such observation missions of the year. The flight, which would follow a previously agreed upon route, was covered under the Treaty on Open Skies signed in 1992 by the U.S., Russia and 32 other nations, including the majority of Europe. It was enacted in 2002. Despite heightened tensions between Washington and Moscow, the post-Cold War agreement permitted the two world powers to essentially spy on another with certain limitations. Read more http://www.newsweek.com/russia-military-plane-spy-us-open-skies-583969
