You need an embassy visa for United States if you have a Ukrainian passport
Visa options for United States
Visitor visa
Travelers need a visa to visit United States for Business or Tourism. A paper or embassy visa is the only visa available for travelers visiting United States. The visa is typically a stamp or sticker added to the passport. Travelers must obtain this visa from a local embassy, consulate or visa center before traveling. Ukrainian citizens and their family members can enter the United States and stay temporarily for 2 years of parole.
This is not offered by sherpa°.
Apply on the government site.