I suggest you read on North Korean military equipment, supplies and operational readiness.
It is all about the details:
They have the largest submarine force in the world; but every one of them is an outdated diesel-electric.
They have a couple hundred fighter airplanes, but their trained pilots get 10-20 hours of practice every year.
And so on...
They aren't capable of a prolonged attack as they don't have enough food( literally ). At best they can defend for a long time and cause a lot of collateral damage with chemical weapons and short range nukes, which is enough to keep their enemies away.
It is all about the details:
They have the largest submarine force in the world; but every one of them is an outdated diesel-electric.
They have a couple hundred fighter airplanes, but their trained pilots get 10-20 hours of practice every year.
And so on...
They aren't capable of a prolonged attack as they don't have enough food( literally ). At best they can defend for a long time and cause a lot of collateral damage with chemical weapons and short range nukes, which is enough to keep their enemies away.