Putin threatening to hit the UK with hypersonic missile? Really?

If the world was lucky enough to have responsible political leaders who actually devote their waking hours to ensuring peace and prosperity on the planet, we would all be able to sleep at night and plan for the future without fearing the world might come to an end at any moment. But we don't. We have Vladimir Putin and Kim Jong-un and the warmongers in Tehran and Beijing who want to disrupt international order and go about threatening everyone. This time it's Putin threatening to fire hypersonic ballistic missiles at those who dared to give long-range weapons to Ukraine to launch into Russia. In other words, the US and UK. Well, he's not going to do that because that would lead to conflagration. But he still gives out the warning because he knows, as the owner and sole controller of thousands of nuclear warheads, he can scare the pants off everyone if and when he likes. But is this responsible leadership? No, it's not. It's all bluff (hopefully) but dangerous bluff. What he is really doing is upping the ante and raising the stakes and all the other cliches, in order to give himself maximum leverage when or if he agrees to chat to Donald Trump about bringing the war in Ukraine to an end. Russia does hold most of the leverage cards, so somehow President Zelensky and his exhausted army have to try and grab some territory back from the Russians in the next two or three months to give them a sporting chance of negotiating not too awful a peace settlement. As of now, Putin holds the trump cards (pun intended).