90% of the oil that keeps the EU nations warm at the moment actually flows through... you guessed it... Ukraine. Some people think the Russians will just turn off the valves to turn off the oil to the EU and Ukraine. No. They won't harm Ukraine at all.
They will simply cut the flow though the valves so there will not be enough oil the keep Europe warm. But just enough to keep Ukraine warm. You think the Ukrainians will send the oil they need on to Europe, and volunteer to freeze in the dark? No. They will simply let the Europeans freeze in the dark.
But the Russians are also now building up troops and armaments on the Ukrainian border, of course.