These are being taken down where they are up high and have had no such graffiti on them. They are also being taken down, particularly, in some meeting rooms where foreigners in Pyongyang encounter and deal with their DPRK counterparts. This phenomenon has not yet fully been analyzed.
Well, that IS interesting.
Has the kidnapping of Japanese young people to serve as Japanese teachers for N. Korean spies rattled this regime? That is so disgusting.