> So was the decision to fight an economic war against Europe's major energy supplier

No, that was Russia's choice. They chose to invade Ukraine with the full and inexcusable intent of occupying territory. Opposing this is not that different from opposing the occupation of Poland nearly a century ago, and boohooing about how it hurts the economy is just so transparently self-serving at the expense of the Ukrainian people and everyone else in former Soviet bloc countries, it makes my teeth hurt.

What was the UK government's choice was being party to the entrenchment of Russia as Europe's major energy supplier over the course of the past decade or so. That was a very bad idea, but unfortunately, there's not much we can do about it in the short term now.