MOSCOW (Reuters) - The defence ministry of the breakaway region of Nagorno-Karabakh reported 54 more military casualties on Friday, bringing the death toll to 158, Russia’s Interfax news agency said in a report. Fighting broke out on Sunday between Azerbaijan and ethnic Armenian forces in the breakaway region of Nagorno-Karabakh -- which is part of Azerbaijan but run by its mostly ethnic Armenian inhabitants -- and has reached its most serious level since a war in the 1990s.