The "fuel shortages" are caused by the blockade started by USA a few months ago, which has also threatened with an actual unprovoked attack against Cuba.

Even just the blockade cannot be considered as anything else but an act of war, even if, as usual, USA does not declare the wars it starts.

In the past, USA at least made attempts to appear that it follows the international laws, but today it makes great efforts to perfectly match the stereotype of the lawless "Imperialist Americans" that was used in the past in the propaganda of the former communist countries.

Any act of war that Cuba would ever do against USA would be perfectly justified by the already done actions of USA, which make random Cubans suffer from serious shortages.