"The United States would put retaliatory tariffs on any country doing that, per Executive Order 14380"
OK. So seafood becomes more expensive for USans.
Norway has about $4 billion in trade each year with the US. Norway's GPD is $650 billion, and their Sovereign Wealth Fund is worth $2.5 trillion.
If they wanted to, they could push oil to Cuba all day long. What the US could potentially do in response, would be to deny them support for the military purchases they have made, such as the F-35. But I'm sure those F-35s would quickly find an out-of-market buyer, and be replaced by similar aircraft.
"We're conducting an illegal war against Cuba and the perpetrators of it should be considered war criminals and arrested and tried."
Under what statutes?
No one is being prevented from delivering fuel to Cuba, other than possible dark fleet ships. But Holland could poor oil into Cuba all day long. So could most countries.
They just don't seem to want to.