The USA could be self sufficient in energy today if need be, but it has been cheaper to import petroleum.  There is not any easy way to be 100% self supporting in today's economy and even if it was, there is the issue of business and investment ties and hot capital that flows globally.  What I see is that once more, Ukraine is the wishbone that great powers are fighting over.  The political class cares more for their bank accounts than the good of the nation.  I have no idea what will be the end result of this, but I wish calmer heads on all sides would take a breath and look at the past century to see where this is heading towards.