Elsewhere in Russia's south, we're looking into reports that a railway station in the Volgograd region was attacked last night as well as overnight footage of damage from Ukraine's Odesa.

Ukrainian drone attacks sparked a massive fire at an oil depot in a rare attack on the Black Sea resort of Sochi.

An overnight Ukrainian drone attack on an oil depot near Russia's Black Sea resort of Sochi sparked a major fire, Russian officials said Sunday, as the two countries traded strikes and the Ukrainian president announced a prisoner exchange.