How do you think it would be if...

Japan's main oil supplier was USA. About 90% of Japan's oil imports were originated from USA. The embargo could easily cripple IJN. Quite provocative move in such a little time, in my opinion.

Provocative?
What obligation did US companies or the government have to keep selling goods to Japan?
As for provocation I would have thought the main provocation was when Japan sank a US warship which was escorting US oil tankers that were being threatened by Japan. I would of thought that was sufficient provocation for the US to block all its trade with Japan.
But no, a country later blocking some of its trade with another country that is on the rampage across a continent is the real provocative move in some peoples book