I’d imagine that plans are already in place on that, I guess it’s going to take time to do.
I'd imagine if Putin wanted to turn off the taps, he could pretty much immediately.
I'd suggest there is also a tap at the other end of the supply, but currently it would be just too inconvenient for western nations to turn it off!
If it fucks the German & French economy for a little while.....tough shit.
If it means the Italians can't heat there homes for a while....tough shit.
If it means UK petrol & diesel hits £3 per litre for a while....tough shit.
We're not the ones getting bombed in our beds.