I'm sure there is some legal stuff happening between the branchs of government that allows that admin to determine the value of aid based on however they see fit, regardless of what congress might claim in a bill.
I'm sure if they really wanted they could claim all the stuff sent was worth $1.
Here's the bill from last year: https://www.congress.gov/bill/117th-congress/house-bill/7691/text
Operation And Maintenance, Defense-Wide
(including transfer of funds)
For an additional amount for “Operation and Maintenance, Defense-Wide”, $15,256,824,000, to remain available until September 30, 2022, to respond to the situation in Ukraine and for related expenses: Provided, That of the total amount provided under this heading in this Act, $6,000,000,000, to remain available until September 30, 2023, shall be for the Ukraine Security Assistance Initiative: Provided further, That such funds for the Ukraine Security Assistance Initiative shall be available to the Secretary of Defense under the same terms and conditions as are provided for in section 8139 of the Department of Defense Appropriations Act, 2022 (division C of Public Law 117–103): Provided further, That of the total amount provided under this heading in this Act, up to $9,050,000,000, to remain available until September 30, 2023, may be transferred to accounts under the headings “Operation and Maintenance” and “Procurement” for replacement of defense articles from the stocks of the Department of Defense, and for reimbursement for defense services of the Department of Defense and military education and training, provided to the Government of Ukraine or to foreign countries that have provided support to Ukraine at the request of the United States: Provided further, That funds transferred pursuant to the preceding proviso shall be merged with and available for the same purposes and for the same time period as the appropriations to which the funds are transferred: Provided further, That the Secretary of Defense shall notify the congressional defense committees of the details of such transfers not less than 15 days before any such transfer: Provided further, That upon a determination that all or part of the funds transferred from this appropriation are not necessary for the purposes provided herein, such amounts may be transferred back and merged with this appropriation: Provided further, That the transfer authority provided herein is in addition to any other transfer authority provided by law.