SEOUL, South Korea — North Korean leader Kim Jong Un urged officials to maintain alertness against the coronavirus, warning that complacency risked “unimaginable and irretrievable crisis,” state media said Friday.

Despite the warning, Kim reaffirmed North Korea's claim to not have had a single case of COVID-19, telling a ruling party meeting Thursday that the country has “thoroughly prevented the inroad of the malignant virus" despite the worldwide health crisis.

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Outsiders widely doubt North Korea escaped the pandemic entirely, given its poor health infrastructure and close trade and travel ties to China, where COVID-19 emerged late last year.

Describing its anti-virus efforts as a “matter of national existence,” North Korea earlier this year shut down nearly all cross-border traffic, banned tourists and mobilized health workers to quarantine anyone with similar symptoms to the disease.

In this photo provided by the North Korean government, North Korean leader Kim Jong Un attends a politburo meeting of the Central Committee of the Workers' Party of Korea in Pyongyang, North Korea Thursday, June 2, 2020. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. Korean language watermark on image as provided by source reads: "KCNA" which is the abbreviation for Korean Central News Agency. (Korean Central News Agency/Korea News Service via AP)

Experts say the country’s self-imposed lockdown is hurting an economy already battered by stringent U.S.-led sanctions over its nuclear weapons and missile program.

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The Korean Central News Agency said Kim during the politburo meeting of the Workers’ Party “stressed the need to maintain maximum alert without a slight self-complacence or relaxation” as the virus continues to spread in neighboring countries.

The agency said Kim sharply criticized inattentiveness among officials and violations of emergency anti-virus rules and warned that a “hasty relief of anti-epidemic measures will result in unimaginable and irretrievable crisis.”

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The North’s official Rodong Sinmun newspaper published several photos of Kim at the meeting, which were the first state media images of him in weeks. Neither Kim nor the ruling party officials who participated were wearing masks.