The war raging between Armenia and Azerbaijan over the disputed Nagorno-Karabakh region has dragged in a complex web of foreign countries.
The current flare-up is the most serious escalation since the early 1990s and has raised tensions between key regional actors, most notably Russia, Turkey, Iran, and Israel.
Ethnic Armenians volunteer recruits gather at a center where they receive their uniforms and weapons. (AP)
Russia: Regional powerhouse trying to mediate