The Trump administration is pausing some weapons shipments to Ukraine, including air defense missiles, following a review of military spending and American support to foreign countries, a senior White House official told CNN.

Defense Secretary Pete Hegseth signed off on the review, which the official noted had been underway for months. It was not immediately clear if military support provided to other countries would be affected.

White House Deputy Press Secretary Anna Kelly said the decision was made “to put America’s interests first.”

The decision to halt some weapons transfers to Ukraine comes after President Volodymyr Zelensky pleaded with Western allies to bolster its aerial defenses after intensifying Russian airborne attacks.

Russia has in recent weeks launched near-nightly air attacks on Ukraine, involving hundreds of drones and missiles. On Sunday, the Ukrainian military said a pilot was killed after his F-16 fighter jet crashed during a Russian aerial assault.