Ukraine has accused two Russian servicemen it said it captured of being part of a special forces group that had killed and wounded Ukrainian servicemen in fighting in its eastern regions and said they would be prosecuted for “terrorist acts”.

A bus exploded in Russia this morning, killing at least seven people and injuring dozens, a spokesman for the emergency ministry said.

The chief editor of a newspaper in central Russia was shot and killed outside his home in what colleagues said today was a contract killing in retaliation for his paper’s coverage of organised crime.