Shalanda Young, the acting director of the Office of Management and Budget (OMB), requested the congressional funds in a letter that warned additional money may be needed in the future. “These funding needs are based on our best information at this time, and we will remain in touch with Congress in the coming weeks and months as we assess any additional resource requirements,” the letter said.

The request comes as Congress has just a little over a week left to produce and pass a government funding bill by the March 11 deadline. Failure to do so could result in a government shutdown and leave federal agencies without the resources they need for projects and priorities.

The supplemental funding the OMB is seeking would specifically address the situations surrounding Ukraine and COVID-19, described in the letter as “urgent and immediate needs.”

The letter said the U.S. is “committed to supporting the Ukrainian people as they defend their country and democracy.”

Since 2021, the U.S. has provided Ukraine with more than $1.4 billion. The requested $10 billion would allow the nation to continue supporting Ukraine and the neighboring region with “additional humanitarian, security and economic” aid, the letter read.

“These resources will mean additional defense equipment for Ukraine, lifesaving humanitarian assistance—such as emergency food assistance—for the Ukrainian people, stronger sanctions enforcement, a dedicated task force led by the Department of Justice to go after the ill-gotten gains and other illicit activities of the Russian oligarchs, and additional support for U.S troop deployments to neighboring countries,” the letter said.

It added that the extra financial resources would support efforts to ward off Russian disinformation and cyberattacks. They would also bolster the strength of Ukraine’s electrical grid by fusing it with the European Network of Transmission System Operators, a nonprofit regulatory association.

As for the requested COVID-19 supplemental funding, the letter said funds from previous coronavirus response bills have supported efforts to get Americans vaccinated, donate vaccines to other countries, provide free tests, order treatment pills and respond to the Delta and Omicron variant surges. But most of that funding has now been used up, the letter noted.

“Without additional resources, we won’t be able to secure the treatments, vaccines, and tests Americans need in coming months and fight future variants. And critical COVID response efforts—such as free community testing sites and testing, treatment, and vaccination coverage for uninsured individuals—will end this spring,” the letter read.

The letter noted that the requests for supplemental COVID-19 and Ukraine funds hinge on the assumption that Congress is already planning to provide federal agencies with full-year appropriations. Without such appropriations, the ability of the U.S. to respond to key situations like Ukraine and the pandemic could be limited, it said.

Update 03/03/22, 11:55 a.m. ET: This story was updated with additional information and background.