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Anti-Terrorist Operation Zone (Ukrainian: Зона проведення антитерористичної операції, romanized: Zona provedennya antyterorystychnoyi operatsiyi), or ATO zone[1] (Ukrainian: Зона АТО, romanized: Zona ATO), was a term used by the media, publicity, the government of Ukraine, and the OSCE[2] and other foreign institutions[3] to identify Ukrainian territory of the Donetsk and Luhansk regions (oblasts)[4] under the control of Russian military forces[5][nb 1] and pro-Russian separatists. A significant part of ATO zone is considered temporarily occupied territory of Ukraine.[8]
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