>No, that was Russia's choice. They chose to invade Ukraine with the full and inexcusable intent of occupying territory...

And what has that got to do with our energy supplies? Did we thumb our noses at Saudi Arabia and stop buying their oil,when they started bombing the shit out of Yemen? Have we sanctioned the US --ever!-- for any of the 88 and counting countries they've attacked since the end of the second world war?

What's so special about Ukraine that we have to throw our own people under the bus because Ukraine hid behind the US's skirts poking the bear next door with a stick and are now suffering the consequences?

  >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

No. That was a very good idea. What was a very bad idea was continuing to treat Russia as a leper state, even after the break-up of the Soviet Union and the [relatively!] bloodless 'liberation' of Eastern Europe. Is anyone surprised that Russia has realised "Fuck it. whatever we do, we're still the bad guys here!" and decided they might as well act accordingly.

But don't fret. I'm sure the good ol' US of A will be delighted to make up the energy shortfall by selling us as much oil & gas as we can send them wheelbarrows full of cash for, in the future. The fact that it's environmentally insane to ship oil & gas all the way across the Atlantic Ocean, when we could have it cleanly flowing through pipelines from our next-door neighbour is a minor detail.