The U.S. government does not offer any benefits or financial assistance to individuals who are here on a B1/B2 tourist/visitor visa. This visa is not designed for those seeking permanent residence or who are entering the U.S. for humanitarian reasons. It is possible that some municipalities have resources available for individuals who are here on a B1/B2 visitor visa who meet certain criteria such as poverty or having minor-aged children.
Certain private or non-profit organizations may offer individuals assistance with food, shelter, or necessities. A non-exhaustive list of resources can be found below in the “Additional Questions” section and at this site: https://www.refugees.novaukraine.org/