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укреплённый район (A fortified district or fortified region in the military terminology of the Soviet Union, is a territory within which a complex system of defense fortifications was engineered.  wikipedia.org 'More); укрепрайон (He showed me pictures of the fortifications of Kyiv in 1941. It had been an ukreprayon, a fortified district; an elaborate set of defences were built on its landward side at the turn of the 1920s and 1930s – by James Meek Tamerlane) | |||