Isn't that just the case for both sides though? As I understand Russia's artillery situation is better than Ukraines at the minute? I'm sure those munitions work perfectly fine in most cases, a 155mm shell isn't very demanding to construct.
The North Korean munitions seem of pretty poor quality. The Russian munitions seem to have been stored very poorly.
Comrade, why spend all that money building a warehouse when you can slip the money into your pocket and stack ammunition in a field?