By Nailia Bagirova and Hasmik Mkrtchyan BAKU/YEREVAN (Reuters) - Azerbaijan said on Sunday it would stop fighting Armenian-backed separatists over the breakaway Nagorno-Karabakh region after two days of clashes, but the other side denounced Baku's gesture as hollow and said violence was continuing. Nagorno-Karabakh, which lies inside Azerbaijan but is controlled by ethnic Armenians, has run its own affairs with heavy military and financial backing from Armenia since a separatist war ended in 1994. "Armenia has violated all the norms of international law.