The incidents signaled a further escalation of the conflict despite urgent appeals from the international community.
Baku and Yerevan have exchanged accusations of firing directly into each other's territory and rejected pressure to hold peace talks as their conflict over the disputed Nagorno-Karabakh region threatened to mushroom into all-out war.
Both reported firing from the other side across their shared border, well to the west of the Nagorno-Karabakh region over which fierce fighting broke out between Azeri and ethnic Armenian forces on Sunday, Reuters reported on September 29.
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The incidents signaled a further escalation of the conflict despite urgent appeals from Russia, the United States and others to halt it, Reuters said.
Azeri President Ilham Aliyev, speaking to Russian state television, flatly ruled out any possibility of talks. Armenian Prime Minister Nikol Pashinyan told the same channel they could not take place while fighting continued.
According to Reuters, further stoking tensions between the two former Soviet republics, Armenia said a Turkish F-16 fighter jet had shot down one of its warplanes over Armenian airspace, killing the pilot. It provided no evidence of the incident. Turkey called the claim "absolutely untrue," and Azerbaijan also denied it.