Why not ask sources for their EXIF data from their digital cameras. Though it could probably be easily faked.
Yes that could be easily faked.
Also, in international relations you dont do that kind of stuff. Presume that if true, it could reach that country as information, and would destabilize it politically. You dont do that unless you'd want to (war, ...).
Also your diplomatic relationship would be toast for a while.
Here is another Asian Boss video on China vs. democracy:
edit: Just so people dont get confused, North Korea is still a military dictatorship of the worst kind (people are 'educated' to adore leaders as gods, for internal stability.)
See f.e:
(Half of that video is probably western PR in some sense, but the other half is not.)
Also in recent years NK opened itself economically (people were allowed to found businesses) and profited from the economic development in china and chinese goods getting onto its markets (trade moved more people out of poverty), but since the Covid Crisis hit (border controls, lower border traffic), and with it the world wide economic downturn, clamp down became stronger again.
Famines are a result of embargoes, central planning and it getting the balance between energy needs and foodproduction 'wrong'. (NK is not a very fertile country, party built a big hydroelectric power station, that reduced waterflow, and fertile mud...) and natural disasters. Then foreign aid is only let into country from china, if at all, ...
edit: Actually, this was the video I was thinking about: