Fighting escalates in Nagorno-Karabakh

This was one of our most-watched videos last week.

Fighting has erupted once more between Armenia and Azerbaijan, two former Soviet republics in the Caucasus region.

At the heart of the decades-old conflict is the Nagorno-Karabakh region. It is recognised as part of Azerbaijan, but its population are mainly ethnic Armenians.

The countries fought a deadly war over the region in the late 1980s and early 1990s.

Although they declared a ceasefire, a peace treaty was never agreed upon.