Russia to attack Britain in five years?

According to yet another British Army general, we have just five years before an invasion by Russia. The government, he says, should start building nuclear bunkers for everyone. What the hell is wrong with all these generals? Britain is not sitting on its own, vulnerable to a massive Russian attack. We are part of the most successful and powerful defence alliance in history. If Putin is seriously considering attacking Britain, and Britain alone, he will face a counter-strike by the US and the whole alliance. Moscow will be obliterated (a favourite Trump word). This is called deterrence, nuclear deterrence. Does Putin, and this British general, seriously think it would make any sense for Russia to select Britain to be removed from the planet? This is all nonsense and scary stuff, and silly. Russia can't even defeat Ukraine, let alone take on the whole Nato alliance. So, please, all these scaremongering generals, remind youreselves it's all about deterrence and allies. We don't need this poor Labour government of ours to start spending billions on nuclear bunkers everywhere.