I don’t know the history of what nor who first “turned the tap on” in Crimea...I suppose since for eons Ukraine has had so many other contractual agreements with Russia just made sense to whoever was Governing at the time strike a deal with the Russians.
Actually the Major Oil Company’s do this throughout the World....but how they operate business with Government Officials is something I know little about.
At any rate...the US snatched away Ukraines gold away early on( for safe keeping of course) far quicker than Putin took Crimea,( to keep the Russian people safe) So the US snatched the gold and Putin Crimea’s oil.
High stakes being played...and as usual who gets to rape the country first and most. As I said before...there are no good guys in this.
Currently, Crimea imports 2/3 of its power:
Energy is another vital import. According to some estimates, Crimea could just about be self sufficient in natural gas – extracted from the Black Sea – though currently two thirds of its power needs come through the rest of Ukraine.