The drills were observed by the defense minister and chief of general staff from Armenia.
Nagorno-Karabakh is part of Azerbaijan but is populated mostly by ethnic Armenians. Clashes regularly break out between the two sides.
At least 30,000 people have been killed and 1 million displaced during six years of open conflict that ended with a cease-fire in 1994.
RFE/RL Caucasus Report
SUBSCRIBE For weekly news and in-depth analysis on Armenia, Azerbaijan, Georgia, and Russia's North Caucasus by e-mail, subscribe to "RFE/RL Caucasus Report."