Information about the mode of entry to Ukraine can be found on page Entry regime to Ukraine for foreign citizens
For current border crossing rules please visit https://visitukraine.today/
The foreigners are eligible to enter or transit through the territory of Ukraine on a visa-free basis if their stay doesn't exceed 90 days in 180 days period.
If you would like to calculate the number of days you are permitted to stay in Ukraine please use the migration calculator program (the program will be downloaded to your computer).
The policy does not apply to US citizens entering Ukraine with aim of the study, work, or other purposes with a duration of stay of more than 90 days (see Long-term visas).
US citizens need a valid passport to enter Ukraine. A visa/Ukrainian residency permit is required for a stay longer than 90 days. If you need a visa, please apply for it in advance at the Embassy of Ukraine or Consulates General as long-term visas can not be issued upon arrival.
Remember, in Ukraine the date is written day-month-year. If you come to Ukraine before your visa allows you to, you will not be allowed to enter Ukraine and are required to return to your point of origin at your own expense.
ATTENTION! As of January 2022, the collection of biometric data of foreigners and stateless persons is required at the time of visa application submission to the Embassy/Consular office.