Because it was only discovered just before Russia invaded the Crimean Peninsula. Do a web search if you're interested. This has been well documented by news articles so I don't need to explain it further. Do a web search if you want more detail.
I’d tell you that there is gas in Ukraine but it isn’t worth extraction because the investments are always raided by connected individuals.
Uh, the Crimea was part of Russia back at the time of the American revolution.