If it was the work of US/UK intelligence
Care to clue us into why, Mr. Tinfoil Hat? What do they have to gain? They don't do things - especially things that cause issues in the public sphere - unless they have a reason.
There's not much point to attempting to frame North Korea - this is about 1/10000000th of the seriousness of gaining ICBM capability to add to their nuclear capacity, so it isn't exactly moving the needle in making them look like a danger to the world at large.