In 2019 Ukraine only imported 30% of its gas. Since the annexing of Crimea it imports this from Europe rather than Russia (although the Europeans mostly get that gas from Russia in the first place!)
If you look at Figure 3 in this linked document you will see 2 main things.
1) there is a lot of gas under and in the sea off Crimea
2) there is a big gas field running from Donbas in the SE across to the NW and this is precisely where the Russian army are now sitting.
I am sure this is just a coincidence though.
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