France, July 24 -- "The attack on an oil tanker in the Red Sea is unacceptable, illegal and further inflames an already volatile situation in the region," EU foreign policy chief Kaja Kallas said in a statement.

"The Houthis must cease all actions that endanger international shipping and the lives of seafarers."

The attack on Saudi shipping in the Red Sea brought the war in the Middle East to a new front and sent oil prices surging.

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Earlier this week, the Houthis said they had struck two Saudi oil tankers after declaring a blockade of Saudi ports.

Kallas said an EU naval mission deployed in the Red Sea to help ships pass through the vital waterway "remains firmly committed to protec...