NATO alliance members agreed on Thursday to scour their arsenals for more air defense systems to protect Ukraine from Russian ballistic missile attacks, as the alliance marked a 75th anniversary overshadowed by the war on its borders.

"Allies understand the urgency," NATO Secretary General Jens Stoltenberg said after Ukrainian Foreign Minister Dmytro Kuleba met NATO counterparts and appealed for new additional air defense systems, especially U.S.-made Patriot missiles.

"Allies will now go back and look into their inventories, look into if there are any ways they can provide more systems, in particular Patriots, but also of course ensure that the systems which are already there have the ammunition but also the spare parts (they need)," Stoltenberg told a news conference.