https://www.globalfirepower.com/countries-listing.asp
Russia is currently ranked as the second most powerful country on earth for military. We are sixth.
They have 3.3 million men ready to go and 800,000 waiting.
Not to mention their Naval and Air fleet ready to go.
We got 230,000 men ready for combat and a poultry 151,000 ready.
Not to mention we are soft as shit and half our country would turn on us from the inside if we went to war, we ain't what we used to be.
The Russians are hard and cold and merciless.
https://www.globalfirepower.com/country-military-strength-detail.asp?country_id=united-kingdom
https://www.globalfirepower.com/country-military-strength-detail.asp?country_id=russia
Let's be realistic if something started we would be waiting for the USA to send over 2 gigantic Naval fleets with thousands of men to defend our shores and without them we'd be fucked.
Basically all we have is the SAS, Royal Marines and UKAF