I have never known a single soldier that was a faggot or a leftist or anything similar.
If you think squadies in likes of Coldstream Guards, Royal Anglian, Royal Irish, highlanders etc are anything like that id suggest you are in danger of ODing on pol memes.
You can bet that russian military leadership dont consider British military capabilty in remotely the way you caricatured.
In reality soldiers, at very least british that ive known, and no dont doubt similar elsewhere are tough no nonsense lads from old industrial regions like south wales valleys, north east, scotland (historically 5m scotland make up 25 pct of of uk infantry).
They would fire at the enemy, because they are highly professional soldiers. The pct of muslims in uk army is borderline nil. "paki commanding officers" basically likewise.
We would probably have a situation that isn't unlike Gallipoli, if only smaller, with those brave 10k-20k British and Australian soldiers sent into the grinder facing up to 30,000 Russian tanks and armored vehicles operating under full artillery cover.
The only real threat to Russia from NATO would be a combined air force effort by all members, but for this to happen they would have to move into Ukraine first, which Russia won't allow. Russia will attack the Ukraine as soon as NATO starts building up a large military presence in that country.
Russia is not likely to attack the Ukraine without the cover of a Pacific front, they will coordinate that attack with a Chinese attack on Taiwan, and conversely, China is a lot less likely to invade Taiwan without an EE/Ukrainian front being open. But if red lines are crossed either in the Ukraine or in Taiwan, then all bets are off.