Alessio Patalano is professor of war and strategy in East Asia at the Center for Grand Strategy in King's College London and senior fellow at Policy Exchange.
Opinion
Russia's blockade of the Black Sea demands a global response
Impact on food supply chains has the makings of an international crisis
Russian Navy boat patrols the Mariupol Sea Port area in Mariupol, eastern Ukraine, on May 30: The battle for the Black Sea is a direct challenge to the global maritime order. © AP
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