If NATO escalates with Russia and starts shooting down her planes it has to be ready to fight a full war. It may well be that Putin the bully backs off, but it is a risk. I’ve little doubt NATO would in the end win such a war, but there is also no doubt there would be massive loss of life and damage before victory was secured. I am certainly against the UK on her own shooting down a stray Russian plane provoking NATO somewhere over NATO’s eastern border. There is no need for us to take such a risk.
Given the structure of NATO any NATO member would be ill advised to take the risk without being sure the US would commit her forces to any resulting fight. If Putin thought the US would not turn up he might well call European NATO’s bluff. In the end the European powers could defeat Russia, but it would take time to get the economies onto a war footing and to get anything like the scale of army and weaponry Russia has already committed to Ukraine. If the US backed the shooting down then there is much reason to suppose Putin would back away.
The immediate response to Russia should be as it always has been to provocative intrusion into our waters and airspace. Put force alongside them and make clear they could be destroyed if they showed more evidence of ill intent.
The UK should concentrate on defending its own airspace and the seas around our islands. History taught us in 1914 and 1939-41 that we could not rely on the US to come to our aid on the battlefield. The US only entered the second world war after much reluctance by US voters because Japan stupidly attacked the US fleet forcing the US into the war. In the post war world of NATO the US and other allies did not come to our military assistance to defeat the illegal invasion of the Falkland islands by Argentina. It was outside the NATO area but that need not have stopped them helping us. We needed our own forces, and just had enough to do the job thanks to their skill and bravery.
The priorities for our increased defence spending must be an Iron Dome over the UK islands to protect us from incoming drones, missiles and planes. It must include enhanced cyber capabilities and much larger and more diverse drone squadrons. It should include enough submarines and support vessels for our two carriers to be able to police our home waters and have expeditionary capability beyond. It also needs a larger army.