<h1>Tariffs on countries selling oil to Cuba imposed by US executive order, pressuring trade partners while invoking sovereignty claims.</h1> An executive order by the US President authorises imposition of tariffs on goods from any country that sells or provides oil to Cuba, creating an extraterritorial trade sanction mechanism; operative effect: countries engaging in oil transfers to Cuba may face punitive tariffs on their exports. The measure exerts diplomatic and economic pressure on trading partners, notably prompting a neighbouring state to announce suspension of shipments while asserting sovereign decisionmaking; operative effect: potential alteration of bilateral trade flows and invocation of state sovereignty in response to unilateral tariff measures.