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He's joking because UK along with USA cheers not only for as many Ukrainians and Russians deaths, they like weakening EU, too.
Brexit didn't happen randomly
Neither did the EU in the first place, and I dare say that the instigators had at least as much ill-will toward the Western Europeans as did those who are applying pressure toward a democratic dissolution of that skid-mark. If only NATO were a thing of the past, provided it hasn't mutated into something even more abysmal, I could sleep a little easier.