North Korean leader Kim Jong Un, center, attends a meeting of the Central Committee of the ruling Workers Party in Pyongyang, North Korea Thursday, May 12, 2022. AP
North Korea, which imposed a rigid blockade of its borders at the start of the pandemic in 2020, had not previously reported any Covid-19 cases.
But samples taken from patients with fevers in Pyongyang "coincided with Omicron BA.2 variant", the official Korean Central News Agency (KCNA) reported Thursday, as leader Kim Jong Un and top officials announced they would implement the "maximum emergency epidemic prevention system".
China is North Korea's biggest trade partner and close ally.
"We sympathise with the current (coronavirus) outbreak situation in North Korea," Chinese foreign ministry spokesman Zhao Lijian said Thursday at a regular presser.
"As comrades, neighbours and friends, China is ready to provide full support and assistance to North Korea in its fight against the epidemic," Zhao said, without offering details on whether China will send vaccines, medical equipment or aid.
North Korea has so far rejected any kind of vaccine programme -- even when offered supplies by the World Health Organization, China and Russia -- and has tried to prevent an outbreak by sealing its borders.
Experts say the nation's 25 million people are vulnerable due to the lack of Covid-19 vaccines, and that the country's crumbling health infrastructure would struggle to deal with a major outbreak.
China is one of the biggest donors of Covid-19 vaccines to developing countries, but exports have dropped sharply in recent months as it battles major virus outbreaks in several provinces.