World Health Organization (WHO) chief Tedros Adhanom Ghebreyesus. WHO Official Website
WHO chief Tedros Adhanom Ghebreyesus and Europe regional director Hans Kluge said oxygen supplies were "nearing a very dangerous point" and that most hospitals could exhaust their reserves within the next 24 hours, putting thousands of lives at risk.
The WHO is working to deliver oxygen cylinders and liquid from regional networks, they said, adding that the supplies would need "safe transit, including via a logistics corridor through Poland".
"It is imperative to ensure that life-saving medical supplies -- including oxygen -- reach those who need them," they said in a joint statement as Moscow's incursion into its neighbour reached its fourth day.
The disruption caused by Russia's invasion of Ukraine has prevented trucks from transporting oxygen from plants to hospitals, which have also suffered power shortages.
Medical oxygen generator manufacturers are also facing a shortage of zeolite, a mainly imported chemical product essential for producing medical oxygen.
Concerns have grown over a looming humanitarian crisis as hundreds of thousands of Ukrainian civilians flee to neighbouring countries or become internally displaced.