There is no oil and little gas worth extraction in Ukraine.
Try googling "Crimea gas deposits" and see what you find...
I'll give you a link for free https://www.ukrinform.net/rubric-economy/3191411-ukraine-loses-half-of-its-natural-gas-deposits-due-to-occupation-of-crimea.html
Ukraine was estimated to possess natural gas reserves of over 1 trillion cubic meters, and was ranked 26th among countries with proved reserves of natural gas before Crimea was annexed by the Russian Federation in 2014. Its total gas reserves have been estimated at 5.4 trillion cubic meters.
“There is no oil and little gas worth extraction in Ukraine.”
Long video but watch from 9 minute mark regarding Ukraine petro deposits.
Why Russia is invading Ukraine