Armenia and Azerbaijan clash over Nagorno-Karabakh, with footage of fighting released

Videos released by both the defence ministry of Armenia on September 27 and the defence ministry of Azerbaijan on September 28 appear to show heavy fighting between the two countries over the disputed Nagorno-Karabakh. The region
is internationally recognised as part of Azerbaijan but controlled by ethnic Armenians. 
The clashes were the heaviest fighting between the two countries since 2016. 

Video source: Armenian Defence Ministry via AP / Azerbaijan Defence Ministry via Reuters