In this handout photo provided by the Ukraine's health ministry press-service, workers unload a plane carrying 500,000 doses of the AstraZeneca vaccine marketed under the name CoviShield, at airport Boryspil in Kyiv, Ukraine, Tuesday, Feb. 23, 2021. After several delays, Ukraine finally received its first shipment of Covid-19 vaccine doses. The country of 40 million is one of the last in the region to begin inoculating its population. (Ukrainian Health Ministry Press Office via AP)