I am the official currency of a nation nestled in the Caucasus, known for its ancient monasteries and dramatic mountain landscapes. My value fluctuates significantly, often impacted by regional political tensions. I'm also sometimes used unofficially in neighboring areas. What currency am I?

1. My nation is located at the crossroads of Europe and Asia.
2. My country is famous for its wine production.
3. My country's name is associated with a historical figure connected with metal.
4. My country had been part of the Soviet Union.