MOSCOW, Aug 21 (Reuters) - Russia's defence ministry said on Sunday that sea-based Kalibr missiles had destroyed an ammunition depot containing missiles for U.S.-made HIMARS rocket systems and other Western-made anti-aircraft systems in Ukraine's Odesa region.

The ministry also said it had destroyed two M777 Howitzers in combat positions in the Kherson region, and a fuel depot in the Zaporizhzhia region that it said was storing more than 100 tonnes of diesel fuel.

Reuters was not able to immediately verify the battlefield reports. (Reporting by Reuters; Editing by David Clarke)