Why The Caspian Sea Has Become The Ukraine War's New Flashpoint

The Ukraine war has just crossed a LINE few saw coming. For years, this conflict was drawn on a map of Europe: trenches, cities, borders. Now it has spilled into one of the world's most overlooked strategic waterways: the Caspian sea. Ukraine says it struck a Russian warship and vessels carrying Iranian-linked military cargo. Tehran's response: a warning that this "will not go unanswered." So why has an inland sea suddenly become a frontline? And what does it tell us about how deep the Russia-Iran alliance really runs? This week's Faultlines digs deep in this explainer. 

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