Iran appears to have moved infantry divisions and rocket artillery to its northwestern border with Azerbaijan amid indignation in Tehran at military exercises performed by the self-styled “Three Brothers” – Azerbaijan, Turkey and Pakistan -and attempts by Baku to hinder Iranian trade flows that are important to the ethnic Armenians of the Nagorno-Karabakh enclave.
[The] war games organised by Baku, Ankara and Islamabad….by all accounts compelled Tehran to send troops and weapons, including armed drones, to the border with Azerbaijan in a show of force…..Another annoyance was Turkey’s participation last week with Azerbaijani forces in submarine and defence group armed forces exercises on the Caspian Sea – the Iranian foreign ministry has referred to the “illegality” of the Turkish presence as regards a convention signed by the states with a Caspian coast.
…Matters escalated on September 15 when Baku confirmed it had detained two Iranian truck drivers. Tehran attempts to show a studied neutrality in the dispute between Baku and the Armenians over Nagorno-Karabakh, but the move against the trucks has tested its patience.
As part of the deployment of troops, Iran on September 20 reportedly tested the Mohajer-6 armed drones of the IRGC’s aerospace division.