Indeed, I posted my thoughts before I read that entry. But it does now appear confirmed.

https://www.msn.com/en-za/news/other/joe-biden-hints-us-may-allow-ukraine-to-use-british-missiles-to-target-deep-inside-russia/ar-AA1qmKMs

And of course the threat to the whole of Europe keeps ringing around the corridors of power, it's exactly the same as the long since discredited domino theory used to justify the Vietnam war.

Though perhaps there is something to the domino theory from another point of view,

Spread a map of Europe out and put it on the table with the West at the top, and Russia at the bottom. Put dominoes on those countries of the ordinal NATO organisation, then start putting dominoes on the others in order, East Germany, Poland,Hungary, Czech, - later Lithuania,Estonia etc Romania, and now possibly suicidally Finland. That surely is a domino theory in practice.

This DW video covers the matter succinctly.