Reuters reports the United States will pre-position tanks, artillery and other military equipment in eastern and central Europe, U.S. Defense Secretary Ash Carter announced on Tuesday, moving to reassure NATO allies unnerved by Russian involvement in Ukraine. Carter, during a trip to Tallinn, said the Baltic states - Estonia, Lithuania, Latvia -- as well as Bulgaria, Romania and Poland agreed to host elements of this heavy equipment. Some of the equipment would also be located in Germany. The U.S. decision to stage heavy equipment closer to Russia's borders aims to speed deployment of rotating U.S. forces as NATO steps up exercises in Europe following Russia's annexation of Ukraine's Crimea region last year. Neighboring NATO countries, especially the former Soviet Baltic states with their Russian minorities, fear Russia could foment trouble on their territories. Moscow denies any such intention.