The article said:

The DPRK successfully carried out the nuclear warhead explosion test some days ago.

In recent years the DPRK has made great progress in developing the national defence.

U.S. President Obama released a "statement" in which he said that the DPRK's test posed a "threat and challenge" to peace and security.

The DPRK, however, is going along its own way.

The U.S. is wholly responsible for making the DPRK have access to nukes.

The DPRK is forced to have access to the nuclear deterrent for self-defence under the worst conditions where there have been persistent sanctions and threats from the U.S. for a long time.