YEREVAN (Reuters) - The Nagorno-Karabakh breakaway region said on Monday that at least 26 more of its servicemen had been killed in fighting with Azerbaijan’s forces. Fighting escalated sharply on Monday between Azerbaijan and its ethnic Armenian mountain enclave of Nagorno-Karabakh, as the two sides pounded each other with rockets and artillery in the fiercest round of the decades-old conflict in more than a quarter of a century.