The U.S. is halting some shipments of air defense missiles and other munitions to Ukraine amid concerns that its own stockpiles of such supplies have declined too much, officials said Tuesday. The munitions were previously promised to Ukraine for use during its ongoing war with Russia under the Biden administration. But the pause reflects a new set of priorities under President Donald Trump. The Pentagon review determined that stocks were too low on some items previously pledged, so pending shipments of some items won’t be sent, according to a U.S. official, who spoke on condition of anonymity to provide information that has not yet been made public.