Attacking Pyongyang with Ukrainian attack drones?

‌North Korea, which is supporting the Russia-Ukraine war with troops and missiles, must be a real thorn in Ukraine's side..
They say it is realistically difficult for Ukraine to directly strike Pyongyang with their current 3,000km attack drones, but
would it be truly difficult to develop 7,000km attack drones in the near future?
I would also love to see a scene where Kim Jong-un is blown up by a Ukrainian attack drone.