A Ukrainian shell that reportedly hit the border town of Donetsk could have "irreversible consequences", Russia's foreign ministry has warned.
According to Russian news agencies, the shell hit a residential building, killing one person and injuring one other.
Russia said the fatality was the result of an "aggressive act" against sovereign Russian territory and against Russian citizens.
More top news
Simon Cowell admitted he was "so embarrassed" after his shirt burst open during an X Factor audition.
Following the promise of further powers for Scotland, David Cameron is now talking about a new deal for the other home nations.
The Suitsy: Man creates business suit onesie