Since the start of the war, Washington has sent about $15.1bn in security assistance to the Kyiv government.
That included $2.2bn in long-term military financing for Ukraine and 18 of its neighbors announced during a visit by Blinken to Ukraine last week, and a $675m weapons package announced by the defense secretary, Lloyd Austin, in Europe that same day.
Sources told Reuters the newest aid package was expected to fund military training, as well as contain munitions, including more high mobility artillery rocket systems (Himars) ammunition for howitzers
US leaders also have made clear that the precision weapons and rocket systems provided by the US and allies, such as the Himars, have been key to the dramatic shift in momentum.