All very well, Malcolm, but we are of an age where a bit of sabre rattling used to be nothing unusual. Unfortunately, the UK is now populated by wokeist snowflakes, who would rather learn to speak Russian than pick up a weapon.
Whilst what you say is true, the likelyhood of the UK actually being invaded (thus requiring a snowflake to pick up a weapon) by anyone is as close to zero as possible. Frankly, we're more likely to be invaded by little green men from outer space. Or the French

. If Russia can't sucessfully invade it's (third world military) neighbour (with which it shares a land border), then it stands no chance invading an island thousands of miles from the motherland.
Our military is not what I'd like it to be, but we are still mid table in the premiership, and able to defend ourselves, even if we would (and do) struggle to defend our friends and neighbours. With the US now seen as unreliable, many European countries are re-assessing their own defensive capabilities, and learning off those with the best and most recent (and ongoing) experiance is vital.