In my view, if we are serious about this, we would be looking at demand management. This is a rationing issue. However we play it, a carbon budget is, by definition, a rationing issue, but what we have not done is to cut back on people driving their very large cars or flying first class or business class. We have had no rationing in this at all.
In the U.K., we have people now who have the choice between eating or heating their homes, because the people who use the lion's share of the emissions—the 10%, 20% or 30% of the population in the wealthy parts of the world—are carrying on business as usual.
If we are serious about trying to constrain Russian imports, we need to be looking at demand management immediately. That's much quicker than looking for renewables or looking for more oil. Then we also need to be putting in renewables as well.
A combination of those two is a policy framework that has some intellectual backing to it, rather than just locking ourselves into yet more fossil fuels.