Russia warns Ukraine of 'irreversible consequences'

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.

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US talking to European allies for more Russian sanctions

US Vice President Joe Biden has told Ukraine President Petro Poroshenko that the United States was working with European leaders on further sanctions on Russia, over the escalation of the conflict in Ukraine.