A unilateral blockade.
Nuclear weapons cannot be used for most conflicts.
But about 30 middle East countries discovered they can bring the highly leveraged US to their knees by mining/drone attacking the two middle east shipping chokepoints.
Strait of Hormuz — Iran, Oman, United Arab Emirates; very near: Saudi Arabia, Qatar, Bahrain, Kuwait, Iraq
Bab el-Mandeb — Yemen, Djibouti, Eritrea; very near: Saudi Arabia, Somalia, Egypt, Sudan, Oman
(maybe add the straits of singapore too)
The "Oil Embargo" days from the 70's had the same effect? They've known this all along. Just different tactics now.
But the USA under Trump is once again close to oil self-sufficiency. Yes they import lots of oil, but they also export domestic oil too.
So it's the EU and China who are hardest hit by the current crisis, yet the EU does nothing at all to help. They're happy buying replacement oil from Russia. 😡