Ukraine says a shortage of Patriot air-defense interceptors is now costing lives after a deadly Russian strike on Kyiv, according to the BBC, which reports that Ukraine's skies are "wide open" and people are "fully exposed" to Russia's missile barrages.

President Volodymyr Zelenskiy said he spoke directly with NATO Secretary-General Mark Rutte about securing more interceptors, according to Reuters.

Why it matters: Patriot batteries are Ukraine's main shield against Russian ballistic missiles, but the same interceptors are also sought by NATO members defending their own airspace. That leaves Kyiv competing for a scarce, allied-controlled resource just as strikes on its cities intensify.

Neither Zelenskiy's office nor NATO has said what, if any, interceptors Rutte agreed to supply. That leaves open how quickly, or whether, depleted allied stocks could be replenished before the next barrage.