In 1994, North Korea signed a treaty that promised they would cease all development. In contingency of this agreement, the U.S. also promised to supply them with oil and two safer nuclear reactors. In 2002, North Korea broke this treaty by restarting their nuclear development programs. This upset and concerned many countries around the world including The U.S.. However, their were arguments back towards the U.S. that they had initially broken the treaty before this conflict when they stopped supplying the country with fuel for thermal power plants. They also found that their project to build safer nuclear plants was behind schedule. As North Korea starts it's nuclear programs up once again, they promise to only intend it for helpful civilian use, however, many fear that this will lead to the development of nuclear weapons. Along with this, came another unsettling break of treaty that stated North Korea would resume ballistic missile tests as well. In 2006, explosions were identified and confirmed as Korean nuclear testing. Due to Korea's history of irrationality and violence, their disobedience and rogue behavior is very concerning to other countries. Even small steps like these that work towards putting nuclear weapons of mass destruction into Korean hands are avoided and frowned apon by many.