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The suggestion was made by John Herbst, previously the US Ambassador to Ukraine. Three Ukrainian naval vessels were seized by the Russian military late last month as they passed through the Kerch Strait. The Kerch Strait separates the Sea of Azov from the Black Sea, passing by contested Crimea.

WORLD WAR 3 fears as US plane flies over Ukraine in show of support

Ambassador Herbst wrote: “The United States and the EU should also look closely at Kremlin provocations in the Sea of Azov, and consider an appropriate response.

“Perhaps it should not permit Russian ships sailing from ports in the Sea of Azov to call at European and US ports, so long as Moscow is obstructing Ukrainian shipping there.”

The suggestion was made in the ‘Beyond Borderlands’ report, produced by the Atlantic Council think tank.

The report was published by the Atlantic Council, a US think tank.

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