Each set of equipment would be enough to equip a military company or battalion, and would go on at least a temporary basis to Bulgaria, Estonia, Germany, Latvia, Lithuania, Poland, and Romania.
Carter said the equipment could be moved around the region for training and military exercises, and would include Bradley fighting vehicles and self-propelled howitzer artillery guns.
But while the stated goal of the move is that American forces moving in and out of Europe will be better able to do training, it also would allow NATO nations to more quickly respond to any military crisis in the region.
The US, said Carter, is also going to work with NATO's cyber center, located in Estonia, to help allies develop cyber defense strategies and other protections against computer-based attacks.
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The countries for the equipment storage were chosen based on their proximity to training ranges, to reduce the time and cost of transporting it for exercises.
US and NATO allies have criticized Russia for its increasingly aggressive actions, including the annexation of Crimea and its backing of separatist troops on Ukraine's eastern border.