>

You're confusing gasoline with natural gas, which is crucially not a liquid. They produce different products as well, but that's not important here. 
Who they are going to to, in a discussion of geopolitics, is probably pretty important to consider as well, no?
That's a peculiar phenomenon - both countries are at war and yet russia continues to pay transit fees to Ukraine for gas and oil. 🤔 >

I understand why Russia does it. I don't really get why Ukraine helps Russia fund the war machine unless they're afraid that not letting it through would create hardship for countries they'd prefer to stay on the good side of? >

It's no great mystery.
Europe needs gas, Ukraine needs Europe and money and Russia needs money.
Combined these needs are a greater concern than the war going on. >

What gas? This is about oil for Hungary and Slovakia. >

Literally the exact same situation. >

Gas and oil aren't really the same thing, though...
Edit: your edit makes it much clearer what you meant, thank you >

They really are though
Liquid fossil fuels shipped through pipelines to be refined and burned at power plants.