"When the eldest of my two sons was in the third year of middle school, his history teacher, who had some experience in China, suggested the students go to live there and have a close look at the old country," Cho said

"China is not the driver behind the escalation of the tensions

"We call upon the US to honor its 'Four Nos' commitment, and we call upon all parties to play a constructive role in easing tensions," Wang said

The official Korean Central News Agency claimed it was a hydrogen bomb

However, the crisis on the Korean Peninsula has spilled over and endangered regional security and stability, as well as relations between other countries