According to inside information in the Kremlin, Moscow will not sell “Bal” missile systems to Azerbaijan. This information was first made public through the Russian daily Komersant on 05 December. One of the reasons for the change in policy appears to be that the missile systems have the potential to shift the balance of military power in the Caspian sea, as the missile systems can strike military ships almost anywhere in the area. Besides the latter, also mentioned was the potential to be used against Armenia in case of a future war over Nagorno Karabakh.
Baku’s interest in the system dates back to 2014, however, the deal was never completed and seems to have reached a dead end.