Babycham1979 You are spouting bollocks.
OP There are various threats against which the UK has to have the means to defend itself; both known and unknown. Russia is currently perfecting asymmetric warfare, where step by incremental step they get themselves into a country and then have control. They tried this in S Ossetia/Georgia in 2008, and blind-sided everyone by hosting Sochi whilst annexing the Crimea. This is why the Baltic states are worried, and why Sweden is issuing guidance on what do to in cse of conflict with Russia, as the Swedes think the security situation is worsening.www.nytimes.com/aponline/2018/01/16/world/europe/ap-eu-sweden-emergency-booklet.html
Russia also resents EU and NATO membership of its 'near abroad' with the Baltic states, and they will rattle cages where they can. They have been sniffing around our infrastructure, specifically the undersea interconnectors for about a decade now, and that is one of the quickest ways to cause harm, by cutting off power supplies. They also indulge in cyber warfare' again, with our dependence on electronic communications etc, another area where they could destabilise the UK and the other NATO nations.
The Cold War has never really ended; and as someone earlier said, Putin is ex KGB so this is in his blood. Russia is re-arming; investing heavily in ships, submarines. artillery etc, and has way more in the way of troops and materiel than the UK has. The US can match them, but has to get the troops and hardware to Europe to do so if it's a non nuclear conflict.
I'm a military daughter, wife, sister, and now aunt. I feel less secure now than I ever did during the Cold War; at least til the Wall came down, there were some conventions and certainties you could rely on. Not with Putin however.