The country faces a shortage of troops in the campaign against Russia's better equipped and larger military
The breakaway region came under Azeri bombardment again on Monday and an official there said the civilian death toll since the start of the fighting had risen to 18.
Azerbaijan does not disclose its military losses but says it has lost 25 civilians. Two civilians have been killed on Armenian territory.
The fighting began on Sept 27 and has surged to its worst level since the 1990s, when some 30,000 people were killed.