[Boudica]

I have no idea what this is about.

This is about the war in the Ukraine. The UK, among other nations, has supplied the Ukranians with weapons to aid in their conflict to defend themselves against Russia. Throughout the entire war, Russia has threatened to take the conflict further, by directly engaging with UN countries on the basis that UN countries supplying certain types of weapons etc would count as an escalation and a declaration of war. However, each time one of the UN countries has supplied such weapons, Russia has not attacked the UN. I would assume because it knows it could not win, at least, not at that moment in time.
I'm hesitant to assume there would be major WW3 level escalation at this stage, but it's worth keeping your ear on the ground and staying informed.