The details on the weapons in some of the paused deliveries were confirmed by a U.S. official and former national security official familiar with the matter.

The last few weeks have seen massive waves of drones and missiles launched against Ukraine by Russia — attacks that are increasing in intensity.

The delayed weapons include dozens of Patriot and NASAMS interceptors, which can defend against Russian missiles, as well as missiles for F-16 fighter jets. Shipments of thousands of 155mm high-explosive howitzer munitions,