The move "was made to put America’s interests first," a White House spokeswoman said, as U.S. munitions have been depleted in recent years.

The Pentagon has halted some shipments of air defense missiles and other precision munitions to Ukraine over concerns that U.S. stockpiles are too low, two people familiar with the decision said on Tuesday.

Ukraine is moving forward with plans for joint weapons production with allies while the U.S. halts some arms shipments.