What's with Dimitry Medvedev?

Dimitry Medvedev, former president of the Russia Federation (not for long and only with Putin's acquiescence) has a way with words. He uses them to bash and sometimes threaten the West. He has become the Kremlin ogre, the one selected to make outrageous remarks which is odd because when he was the (small b) boss in the Kremlin he seemed quite mild and interested in being far nicer than Putin. He was someone the West could almost do business with. But these days, Medvedev pops up whenever the Kremlin wants to scare the West. He is the deputy chairman of Russia's security council and uses this platform to rage against the West whenever he gets the opportunity. In his latest foray he said Russia would be entitled to attack individual British officials, military or civilian, who had any dealings with the arming of Ukraine. This followed the surprising remarks by James Cleverly, the British Foreign Secretary, who when asked about the latest drone attacks on Moscow, presumably by Ukrainian or pro-Ukrainian perpetrators, said the Kyiv government had every right to carry out strikes inside Russian borders as part of their efforts to defend themselves against Russian aggression. It was surprising because the US has always made it clear it did NOT support Ukraine attacks inside Russia and insisted that US-supplied weaponry should not be used to target anywhere in Russia itself. I thought the UK was also signed up to that. But Cleverly obviously thinks differently. His comment, whether backed by the UK government as a whole or not, clearly annoyed Medvedev which is why he came out with his threat to target British officials. All pretty stupid and irresponsible in my view.