Would shutting Europe and China's oil supply down really hurt us?
In the US we buy more oil from Canada and Mexico than from Iran and Iraq.
China might get by with its Cuban oil but Europe will be severely starveing.
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You might be
clueless
as to how international commodities are bought and sold.
China does not import oil from Cuba. China does not export oil to anyone. Cuba has 11 million people and any amount of oil it uses in comparison with China, which has 1,1000 million would be inconsequential. But there is no oil commerce between China and Cuba at all, so this is meaningless.
Neither the United States nor the US government (except for the emergency reserves) does not import oil. Companies import oil, and they pay the world price. If there is a small supply and a high demand, the price goes up everywhere.
If no oil went to Europe or Japan or China, this would shut down both imports from and exports to either region. I don't suppose you have bought any products recently that were not made in the US, so this would naturally not affect you
.