The event, attended by prominent members of the Ukrainian defence industry, was hit by ballistic missiles in the middle of the day.
One death is reported in what President Zelensky calls "one of the most massive ballistic attacks" on Ukraine's capital.
Ukraine is particularly vulnerable to ballistic missile attacks due to a shortage of Patriot air defence munitions.
The announcement comes after Jordan said it intercepted 10 Iranian missiles fired into its airspace overnight into Saturday.
Russia attacked Ukraine with missiles and drones on Saturday, killing two and wounding 19 others, officials said, as Kyiv awaits supplies of air defence munitions after a shortage has left it exposed to Russian attacks. Eleven people were wounded in the capital, Kyiv, by an attack that used ballistic and cruise missiles as well as drones. “Civilian infrastructure was hit even before the air raid alert was issued,” President Volodymyr Zelensky said, adding that rescuers were working on the site....
In the latest salvo in one of the war's deadliest months, Russia hits Kyiv with ballistic missiles and 121 drones.