Russian forces targeted a Ukrainian command post while senior Ukrainian military officers were holding a meeting, Russian Defense Ministry said, reported DW, quoting agencies.
Moscow said they used sea-launched "Kalibr" rockets in the attack on the site near Dnipro, Ukraine's fourth-largest city.
"Over 50 generals and officers of Ukrainian military were eliminated in the strike" including members of the high command, said Russian Defense Ministry spokesman Igor Konashenkov.
The spokesman also said Russia destroyed a tank repair plant in Kharkiv as well as 10 howitzers and up to 20 military vehicles in Mykolaiv in separate missile strikes.
DW was not able to independently verify the claims.