Russia Nuclear Doctrine Explainer

FILE - In this undated photo released on April 13, 2021, by the Russian Defense Ministry Press Service, a Tu-160 strategic bomber of the Russian air force is shown on a training mission somewhere in Russia. The country's nuclear doctrine details when its atomic weapons can be used – whether in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Vadim Savitsky/Russian Defense Ministry Press Service via AP, File) AP PROVIDES ACCESS TO THIS PUBLICLY DISTRIBUTED HANDOUT PHOTO PROVIDED BY RUSSIAN DEFENSE MINISTRY PRESS SERVICE; MANDATORY CREDIT. FILE PHOTO

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