Beijing called on Thursday for constructive efforts to ease tension on the Korean Peninsula.

The appeal came after a report said the Democratic People's Republic of Korea's top leader Kim Jong-un had announced that his country is capable of detonating a hydrogen bomb.

The DPRK has turned into "a powerful nuclear weapons state ready to detonate (a) self-reliant A-bomb and H-bomb to reliably defend its sovereignty and the dignity of the nation", the official KCNA news agency reported on Thursday, quoting Kim.