Azerbaijan and ethnic Armenian forces accused each other on Monday of launching new attacks in and around Nagorno-Karabakh, increasing strains on a two-day old humanitarian ceasefire intended to end heavy fighting over the mountain enclave.

Russia, which brokered the ceasefire, appealed for both sides to respect it and Luxembourg reiterated European Union calls for Turkey, an ally of Azerbaijan, to do more to secure an end to hostilities that have killed hundreds of people.