Russia leads by far, followed by Norway and UK - then Libya.
Btw, the U.S. refineries are known for being obsolete due to marginal investments for decades - the European refineries are on the average not in such bad shape, at least not the Central European ones. I doubt that they would need to retool mush - and even if they did, we've got a huge industry sector for machine & tool production.
Overall I think a loss of the Libyan 7% oil imports would push us out of business as usual, but it wouldn't be a really major national problem.
In worst case we simply offer more money for gasoline than the East European can afford.
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