Ukraine is upgrading its Neptune missile, which was used to sink Russia's most powerful warship in the Black Sea

• Ukraine is working on an updated version of its Neptune missile that sank a Russian warship last year.
• An official confirmed the work for the first time. Reports say the missile's range could be extended.
• A Neptune sank the Moskva, Russia's flagship in the Black Sea, last April.

A Ukrainian defense official said the country is working on an updated version of its Neptune missile, which sank Russia's most powerful Black Sea warship last year.