Ukraine faces a potential battlefield crisis due to a lapse in weapons deliveries from the United States, NATO and officials have warned.

“Every day of delay in the decision in the United States on providing more support to Ukraine has consequences on the battlefield,” NATO Secretary-General Jens Stoltenberg told reporters Wednesday. “That’s one of the reasons why the Ukrainians now have to ration ammunition and why they are struggling to keep up with the Russians who are now able to outgun them with more weapons and more ammunition than the Ukrainians have.”