Iran has summoned Ukraine's diplomatic chief of mission, after an attack on one of its commercial vessels in the Caspian Sea.
Tehran says one sailor was killed and another injured in the Ukrainian attack.
Iran is accusing Kyiv of trying to expand a war beyond its borders.
But Ukraine says it was targeting Russian vessels carrying Iran-linked military cargo.
President Volodymyr Zelenskyy also says Russia is assisting Iran in its military campaign in the Middle East.
Paul Musgrave, Associate Professor of Government at Georgetown University in Qatar, tells Al Jazeera the Caspian Sea could become a new front, widening threats to shipping, energy supplies and global markets.
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