The U.S. has provided $350 million in military aid in the forms of weapons from U.S. stockpiles over the past week, bringing the total aid to Ukraine to roughly $1 billion over the past year.
And a new breakdown of that aid shows that the U.S. compressed the process to provide this aid to just a matter of hours and days.
"You can see how fast we are moving to get security assistance on the battlefield," a senior defense official said, noting that overall officials remain "very impressed" with how Ukrainians are fielding those weapons. "They are having a real impact."
"All of us have been tremendously impressed at how they have used these weapons on the battlefield," the official added. "Kremlin watchers have also been surprised by how well these weapons have performed on the battlefield."
The official noted that the process to move the existing stockpiles to Ukraine would normally take months. The U.S. has already sent 70% of the security assistance over the past seven days.
"We keep exceeding what we thought we could do."
The State Department said the last tranche of assistance to Ukraine is "the single highest amount in U.S. history."
The U.S. previously authorized a $60 million package in Nov. 2021 and $200 million in military aid by the end of Jan. 2022.
Assistance to Ukraine since the initial Russian invasion of Crimea now totals $3 billion, with Britain, Canada, Poland and Lithuania also providing assistance through their own efforts in that time.
Fox News' Jennifer Griffin contributed to this report.