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, EDNews.net reports citing Fox News.

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.

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.