The official said the two packages announced on March 20 and April 4 would be the last ones announced by the Biden administration for the foreseeable future, despite Ukrainian pleas for more artillery and ammunition.
The official described the two packages as a "last-ditch effort" to prop up Ukrainian forces, who are burning through ammunition faster than its allies can provide it, leaving the weapons stockpiles of the US and other NATO countries critically low.
The Biden administration on April 4 announced a $2.6 billion package of military assistance for Ukraine that included additional ammunition for the High Mobility Artillery Rocket System (HIMARS) and the Patriot air defense system.
On March 20, the Biden administration announced a $350 million weapons package that included ammunition for HIMARS, howitzers and Bradley combat vehicles, among other equipment.