Washington DC - President Donald Trump said Friday that "Cuba is gonna fall pretty soon" in a renewed threat to the island already facing a crushing US blockade.

"They want to make a deal so badly," Trump told CNN in an interview a day after suggesting that he would turn his attention fully to Cuba after his unprovoked war against Iran is finished.

"We've got plenty of time, but Cuba's ready – after 50 years," he said, adding that he would send Secretary of State Marco Rubio "over there and we'll see how that works out."

Both Trump and Rubio – the son of Cuban immigrants – have made no secret of their intention to escalate US aggression against the island as part of an ideological crusade against its communist government.

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Following the abduction of Venezuelan President Nicolas Maduro – a key oil supplier to Cuba – the Trump administration imposed a brutal fuel blockade on Havana.

No oil has been imported to Cuba since January 9, forcing airlines to curtail flights to the island and deepening a long-running economic crisis caused in great part by decades of a suffocating US trade embargo.

UN experts have condemned the Trump administration's actions as a "serious violation of international law and a grave threat to a democratic and equitable international order."