The regional department of the border guard service said the man crossed the Ukrainian-Russian border illegally, according to the report.
"The detainee crossed the state border of the Russian Federation beyond the established check points; he had no ID on him," reads the statement.
Besides administrative proceedings for violation of the regime of the Russian state border, the Russian authorities consider launching criminal proceedings against the Ukrainian citizen for illegal crossing of the Russian border.
Read alsoRussia promises to fine and return abducted Ukrainian paratroopersAs UNIAN reported earlier, in early September last year, the Russian subversive group had kidnapped three Ukrainian troops from the 79th airmobile brigade.
According to the Russian border guards, the Ukrainian military allegedly decided to chat with the Russian Marines on the other side of the lake Sivash at the de-facto border with the occupied Crimea.