Russia's FSB Security Service has detained a resident of occupied Crimea on suspicion of "participating in an illegal armed formation," namely the Chelebidzhikhan Battalion.

The nab has been taken into custody, Russian news agency TASS reports citing the FSB's press service.

Criminal proceedings were initiated under Part 2 of Article 208 of the Criminal Code of the Russian Federation (participation in the activities of an illegal armed group operating on the territory of a foreign state for purposes contrary to the interests of the Russian Federation).

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The FSB claims a man left for mainland Ukraine in 2016, where he allegedly joined the ranks of the "Crimean Tatar Volunteer Battalion named after N. Chelebidzhikhan" led by Lenur Islyamov. After returning to the peninsula, he allegedly "continued his criminal activities to participate in the battalion."