Russian missile strike on Ukraine city kills three

"According to preliminary information, the enemy struck civilian infrastructure in the Sumy district with a ballistic missile," Ukraine's State Emergency Service said.

"Three people are known to have died (two died in hospital, including one child) and 11 were injured, including five children," it added.

Photos released by the emergency service show firefighters putting down a fire in a private house that was reduced to rubble.

Moscow has ramped up its advances on Sumy, where it seeks to create a "buffer zone" after it has recently pushed Kyiv's forces out of the bordering Russian Kursk region.

The strike comes as Ukraine launched a barrage of drones on Russia, killing one woman and forcing Moscow to close a dozen of airports just days before foreign leaders gather there for a major Victory Day parade.