Russia’s defense minister accompanied North Korean leader Kim Jong Un to a defense exhibition that featured the North’s banned ballistic missiles as the neighbors pledged to boost ties, North Korean state media reported on Thursday.
How can one tell that the missiles are banned? They just look like missiles to me, and I doubt North Korea is banned from developing missiles completely. Only possibility I can think of is that the missiles are banned because they're nuclear-capable, but presumably what's actually banned are nuclear warheads.
I'm looking for a military-based answer that explains how it's possible to tell from the images that the missiles are banned.