How do you know it would never get to that point?
It's not true that Russia isn't worried about our land forces either, they take a keen interest, though more to the point this was an incident that took place at sea and involved a type 45, more than capable of dealing with multiple aircraft, not really a good idea to actually attack it with 20+ aircraft circling given it could independently target and destroy all of them.
I just can't imagine anyone crazy enough, and Putin wants a life of luxury, nuclear Armageddon kind of ruins that plan, ditto the other dictators.
They admire the ability of our land forces to deploy in a speedy fashion, however we couldn't even give them a nose bleed if it came to it on the ground unfortunately.
Air wise we are more than a match for them, naval wise we have great ships but far far too few.