Rodong Sinmun also denounced in a separate commentary the administration of US President Donald Trump for spearheading new UN sanctions against North Korea and threatened that "as long as the United States will pursue hostile action, it will continue to receive big and small gift packages from us".

North Korea may now possess nuclear weapons that can be used in an actual war, Japan's defense minister said Sunday following the North's sixth nuclear test a week ago.

Speaking at an economic forum in Russia's eastern port of Vladivostok, Putin said Thursday he believes the Trump administration is "willing to resolve the situation".

According to reports, South Korean Nuclear Safety and Security Commission experts detected xenon radionuclides in air samples collected in the country after North Korea's nuclear test.

On the busy streets of Seoul on Friday, residents were bracing for Foundation Day: one of the most important public holidays in neighbouring North Korea and one that is often marked with a show of military force.

The announcement by the Swedish Foreign Affairs Ministry on Friday came hours after Mexico's government said it declared North Korean Ambassador Kim Hyong Gil as persona non grata and ordered him to leave the country within 72 hours in response to Sunday's nuke test.

The U.S. and South Korea should "immediately stop the deployment process and withdraw relevant equipment", Geng said.

In South Korea, thousands of police officers in riot gear swarmed some 400 protesters who had been occupying a road leading to the site where the Terminal High-Altitude Area Defense System is installed in the rural town of Seongju.

Juche is North Korea's homegrown ideology of self-reliance that is a mix of Marxism and extreme nationalism preached by state founder Kim Il Sung, the current leader's grandfather.

Protesters shout slogans during a rally against the deployment of an advanced US missile defense system called Terminal High-Altitude Area Defense, or THAAD, near the presidential Blue House in Seoul, South Korea, Friday, Sept. 8, 2017.

The military is particularly focused on the possible launch of a Hwasong-14 intercontinental ballistic missile (ICBM) or a Hwasong-12 intermediate range ballistic missile (IRBM).

There was no chance the xenon "will have an impact on South Korea's territory or population", the statement said.