https://www.cbc.ca/news/politics/natural-resources-ukraine-war-1.6467039
Roughly 80 per cent of Ukraine's oil, natural gas and coal production reserves can be found in the Dnieper-Donetsk region, which has been the major focus of Russia's military operations to "liberate" the country, the SevDev report noted.
Equally importantly, Ukraine is thought to have the second-largest natural gas deposits in Europe, estimated at 1.2 trillion cubic metres of proven reserves — and possibly up to 5.4 trillion cubic metres, much of it the now-contested offshore Black Sea region.