All foreign nationals must have Health Insurance Certificate. Such Health Insurance Certificate shall be issued by company registered in Ukraine, or foreign insurance company that has a representative office in Ukraine and/or is in the treaty relations with insurance company the partner in Ukraine. Health Insurance Certificate must cover costs related to COVID-19 treatment, observation and must be valid during the whole stay of visitor in Ukraine.
The insurance policy that was purchased through the portal can be postponed for the required period for the tourist. The date change procedure can be performed several times.
Children under the age of 2 are exempt from presenting a COVID-19 test.
Travelers with proof of recovery from the virus within the last 90 days prior to boarding. Proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.
More info at the CDC site
Travelers who did not get tested, are advised to stay home and self-quarantine for 10 days after travel.