Before everyone heads for the shelters, and politicians hit the red - ironic - button, which leads to MAD (Mutually Agreed Destruction) let me allay you fears over this article http://www.telegraph.co.uk/news/uknews/defence/11426692/RAF-jets-scrambled-more-than-40-times-to-intercept-Russian-bombers.html
A Big joke
When I was at RAF Lossiemouth this situation happened so often it was like the 5:00 Charlie sketch in M.A.S.H. They'd send a plane over, we'd respond, wave goodbye. laugh it off and come home. There was NO threat then, and there is none now.
Let us get real, there is no military value to taking the UK. We are not connected to Europe, and too far for an air attack on the US mainland. Why in the name of God, would anyone want to invade here? After all there are more than enough "Sleeper Cells" here for the Communists to take over without war.
If you think the US will rush to flood our shores as they did in the 1940's, you can kiss that idea goodbye. They did that because we still owed money from Lend Lease after WW1. There are very few - if any- USAAF bases in the UK, hell we don't have any in Germany now.
People forget the threat isn't Russia, it's coming from North Africa/Middle East. Despite Putin's supposed threats, he knows they would have to fight a land war, which would cost thousands of lives, to get a foothold. After Afghanistan, and with supplying the Middle East with arms since World War 2, they cannot afford a war; we do you think so many Communists moved to Europe.
Why do I think the Middle East is the threat?
If you take a look at the history of the area from Algeria to Palestine there have been constant wars. The mentality of some of the ruling parties needs to be questioned. Plus, they never signed the non-aggression pact, so, they are not bound by an agreement not to use nuclear weapons.