Following the 9/11 attacks in the US, Washington put North Korea on the axis of evil list and has since contended that North Korea's possession of nuclear weapons poses a serious threat to the world. Several times, the US administration proposed bringing North Korea before the UN Security Council to impose economic sanctions. However China, North Korea's main ally and trading partner, indicated that it would likely veto any sanctions on Pyongyang.
The type of insulation you need depends on where it will be installed, what R-values are required and your budget. Where you live also affects which insulation you choose. For example, a home in Arizona will have different minimum R-value requirements than one in Minnesota.
There are many different materials used for insulation. Engineers often use fiber glass, wool, cotton, paper (wood cellulose), straw and various types of foams to insulate buildings. A layer of trapped air can serve as insulation, too! Some insulating materials are suitable for sound proofing, as well.