Armenia said on Tuesday that four military personnel were killed and one was wounded during the shelling from the Azerbaijani side on the border.

Azerbaijani armed forces discharged fire toward the Armenian combat positions in the vicinity of Nerkin Hand, southern Armenia's Syunik region, according to the Armenian Defense Ministry. 

Azerbaijan's border guards said the move was in response to Armenian troops opening fire twice late on Monday on Kokhanabi village in the northeastern Tovuz region.

Armenia denied the allegation, saying the claim that its troops had twice "fired against the direction of Azerbaijani positions situated in the northeastern part of the border does not align with reality."

Russia has called on Armenia and Azerbaijan to show restraint.