UK: Defence Secretary Streeting warns Britain faces unprecedented risk of war with Russia
(londonlovesbusiness.com)
I don't think Streeting wants the UK to go to war. I think he's saying that the UK should invest more in defence.
Think about this: why did Russia invade Ukraine instead of the Baltics? Probably because the Baltics are in NATO, so Putin knows it would be much more difficult to annex Baltic land, because the whole of NATO would potentially defend the Baltics.
Better defence doesn't start war; it deters war.