Russia's defence ministry said on Monday that 20 people had been killed and 28 wounded when a Ukrainian missile with a cluster charge exploded in the city of Donetsk in eastern Ukraine.
The ministry provided no evidence and Ukraine denied launching such an attack. Reuters could not independently verify the statements by either side.
"It is unmistakably a Russian rocket or another munition, there's not even any point talking about it," Ukrainian military spokesman Leonid Matyukhin told a televised briefing.