Russia warns Ukraine of consequences over escalation of cross-border violence

Russia has warned Ukraine against what it calls continued attacks on its territory after a Russian man was killed by a shell fired from inside Ukraine. In a statement, the Foreign Ministry has pledged to respond to the escalation of violence near its borders as Kiev stepped up military operations against pro-Russian forces. Moscow also said it has the right to take measures to protect Russian citizens. Russia has said it's investigating the murder after a shell hit a residential area in Donetsk. Kiev denies firing on the Russian territory, blaming it on pro-Russian forces who still control much of the border area.