The decision left officials on both sides of the Atlantic scrambling to find out how long the pause might last.

The White House cited Pentagon concerns that some American arms stockpiles were dwindling too low. Among the affected weapons were air defense systems, bombs, missiles and artillery rounds.

NATO boss Mark Rutte, who has been dubbed the “Trump whisperer,” warned against the US decision to halt key weapons shipments to war-torn Ukraine, fretting that it undermines peace