I have a German NAV in the Caspian Sea, USSR and Germany are at war.
A Soviet unit on the Caspian coast is still in supply (it says its tracing supply to Astrakhan), even though no Soviet SCS or NAV points are in the Caspian.
Notice the Afghan MTN is also still in supply as well.
It seems the Caspian is not following the same supply rules as normal sea areas.


