Why is the US putting pressure on Cuba and what are Trump's aims?

The US has warned that a peaceful agreement with Cuba is unlikely, Havana insists this is a "fraudulent case" designed to justify military intervention.

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Accusing Cuba of posing a national security threat, the US has hit it with an oil blockade, sanctions and now an unprecedented murder indictment against former leader Raúl Castro.

Washington is also warning that a peaceful agreement with the Caribbean nation is unlikely, while Cuba says the US is using a "fraudulent case" to justify military intervention.

But what is driving the US pressure on Cuba and how is it responding?

Since returning to the White House, Donald Trump has made clear his desire to change Havana's leadership and has openly mused that Cuba is "ready to fall".