Armenia’s acting prime minister proposed stationing Russian border guards along the country’s border with Azerbaijan, as tensions between the two ex-Soviet nations continue to simmer Thursday.

Prime Minister Nikol Pashinyan floated the idea a day after three Armenian troops were killed in cross-border hostilities between Armenia and Azerbaijan, which for decades have been locked in a conflict over Nagorno-Karabakh. The two countries accused each other of starting Wednesday’s fighting, which wounded soldiers on both sides.

Azerbaijan said Armenian forces opened fire at its positions on the Kalbajar section of the border, and the Armenian military said its personnel were attacked by Azerbaijani forces.

Mr. Pashinyan said Thursday that stationing Russian border guards along the border would allow to carry out the demarcation and delimitation of the border without the risk of military clashes.

Tensions on the border have been simmering since May, when Armenia protested what it described as an incursion by Azerbaijani troops into its territory. Azerbaijan has insisted that its soldiers were deployed to what it considers its territory in areas where the border has yet to be demarcated.

The two countries fought a seven-week war in 2020 in which Baku reclaimed a significant amount of territory held by Armenia since the mid-1990s.