Azerbaijani, Georgian and Turkish troops have begun an exercise aimed at improving security for energy pipelines.
The exercises near Ankara will last until September 28.
Representatives of the three states' armies and security forces responsible for guarding pipelines are taking part in the drills.
In May, the flow of Azerbaijani natural gas to Turkey via the Baku-Tbilisi-Ceyhan pipeline was halted after an unexplained explosion hit the line on Turkish territory.
In June, Turkey, and Azerbaijan signed a deal to build a $7 billion Trans-Anatolian natural-gas pipeline (TANAP) -- a project meant to carry Azerbaijani natural gas to European markets without passing through Russia or Iran.
Based on reporting by apa.az and apsny.ge