Blinken was in Seoul earlier this week after attending a Group of 7 foreign ministers meeting in Japan. He met with South Korean president Yoon Suk Yeol and other top officials.

During his visit to the South Korean capital, he said military ties between Pyongyang and Moscow were “growing and dangerous”, and urged Beijing, Pyongyang’s main ally, to restrain the nuclear-armed North.

Pyongyang today condemned Blinken and said his comments were “irresponsible and provocative”.

The remarks “only escalate the dangerous political and military tension in the Korean peninsula and the region”, Pyongyang’s foreign ministry said, according to the state-run Korean Central News Agency.

“The US should be accustomed to the new reality of the DPRK-Russia relations,” it added, using the North’s official name.

Historic allies Russia and North Korea are both under international sanctions – the former for its invasion of Ukraine and the latter over its nuclear weapons and missile programmes.

Their growing military cooperation has been a source of concern for Ukraine and its allies, especially following North Korean leader Kim Jong-un’s summit with Russian president Vladimir Putin in September.

Seoul has said that Pyongyang sent one million artillery rounds to bolster Moscow’s war in Ukraine in exchange for advice on satellite technology.

Pyongyang said today that “no matter what others may say, the friendly and cooperative relations between the DPRK and Russia aspiring after independence, peace, and friendship will steadily grow stronger”.

Following Blinken’s visit, US secretary of defence Lloyd Austin is set to meet with his South Korean counterpart on Monday in Seoul, as the South and the US ramp up their own defence cooperation.