Teams from Armenia and Azerbaijan have drawn blood, bones and lost soldiers in the worst yet of two weeks of fighting along the international line dividing the two countries.
Armenian reports say 10 Armenian soldiers have been killed and dozens are missing since fighting erupted last week.
But Azerbaijan said four of its soldiers were killed in the clashes and two others were missing on Saturday, leaving the death toll at five. The region remains tense, despite Iranian and Russian mediation efforts.
The large-scale cross-border war began last week, after Armenia launched airstrikes on Azerbaijani territory. Azerbaijan responded with a bombardment.
In recent days, both sides have continued fighting, with heavy artillery fired from Azeri villages, over the Armenian border.
These alleged airstrikes on Azerbaijani villages are key to the negotiations because the deaths and injuries both sides have incurred are clearly provocations.
If true, the bombings are likely an attempt to appear defensive while Russian and Iranian diplomats, both trying to broker an end to the fighting, try to call it a ceasefire.
On Friday, Iranian Foreign Minister Mohammad Javad Zarif met with his Azerbaijani counterpart, Elkhan Hamidov, in the Armenian capital of Yerevan.
According to media reports, Iran sought to calm the situation, and suggested regional governments consider a peace plan. However, Iran has also helped train and equip Azerbaijani guerrillas in the past and is supporting the government of President Aliyev.
The rhetoric is high-strung, but the situation remains tense.
Pentagon officials say it’s too early to say whether the recent tensions will turn into a major war.
Fox News’ Lucas Tomlinson, Jake Tapper and Brenda Buttner contributed to this report.