The current Korean problem has people looking up at North Korean missiles having nuclear weapons on them. Perhaps the fact that the North Koreans have been digging tunnels under the border between them and South Korea for years should be recalled. A nuclear weapon can be used as a land mine to defend ground, too.
There is a known link between Iran and North Korea. If the North Koreans could use nuclear weapons to defend its borders, then Iran could use them to defend its oil and gas resources.
We must not forget that the delivery system is reduced by using nuclear weapons as land mines. The weak are the weapons of the weak.
It would be important to remember that the Asian land mass has two large states that are operated by regimes not known for popular methods of rule: Russia and China. These regimes have to have a reason to exist based on internal power politics. These regimes have borders based on nationalism as do Iran and North Korea.
The North Korean regime shouldn’t even exist. The British Prime Minister Lord Halifax said this about Nazi Germany after a visit in which he went to Hitler’s mountain house and Hitler came down some stops and opened the car door. Halifax got out and said, “Where is Hitler?” He thought Hitler was the doorman!
The spread of nuclear technology has been a problem after we made and used the first ones due to a fear of Hitler making one. This technology can be used in many forms and could upset the current realities in trading for economic reasons.