A new Iranian warship adds to the quiet naval buildup on the world's largest lake

• Iran introduced a new warship to its Caspian Sea fleet in early November.
• The warship adds to a years-long naval buildup among the five countries with Caspian coasts.
• Tensions are unlikely to boil over but each country has claims that could make the sea a flashpoint.

Iran introduced a new warship to its Caspian Sea fleet in early November, adding to a years-long naval buildup among the five countries that share the world's largest lake.