Boxes of Sputnik V vaccines are unloaded from a truck at a warehouse of Hungaropharma, a Hungarian pharmaceutical wholesale company, in Budapest, Hungary, Thursday, March 4, 2021. (Zoltan Mathe/MTI via AP)

Boxes of Sputnik V vaccines are unloaded from a truck at a warehouse of Hungaropharma, a Hungarian pharmaceutical wholesale company, in Budapest, Hungary, Thursday, March 4, 2021. (Zoltan Mathe/MTI via AP)

Employees unload the newly arrived coronavirus vaccines from Chinese pharmaceutical company Sinopharm at the logistics base set up to in the parking lot of the government office in the 13th district of Budapest, Hungary, March 3, 2021. (Zsolt Szigetvary/MTI via AP)

A pharmacist holds a packet of Sputnik V vaccines to be used for the first dose in the pharmacy of the Borsod-Abauj-Zemplen County Medical Center and University Teaching Hospital in Miskolc, Hungary, Tuesday, March 9, 2021. (Janos Vajda/MTI via AP)

FILE - In this file photo taken on Friday, Feb. 19, 2021, Nurse Szilvia Lukacs administers a shot of the Russian vaccine Sputnik V to a patient at Zala County Szent Rafael Hospital in Zalaegerszeg, Hungary, as the vaccination with Sputnik V against the new coronavirus continues in the country. Russia’s boast in August that it was the first country to authorize a coronavirus vaccine led to skepticism because of its insufficient testing on only a few dozen people. Now, with demand growing for the Sputnik V, experts are raising questions again, this time over whether Moscow can keep up with all the orders from countries that want it. (Gyorgy Varga/MTI via AP, File)

Boxes of Sputnik V vaccines at a warehouse of Hungaropharma, a Hungarian pharmaceutical wholesale company, in Budapest, Hungary, Thursday, March 4, 2021, after a shipment of 280,000 doses of the Russian vaccine Sputnik V arrived in Hungary. (Zoltan Mathe/MTI via AP)

Employees unload the newly arrived coronavirus vaccines from Chinese pharmaceutical company Sinopharm at the logistics base set up to in the parking lot of the government office in the 13th district of Budapest, Hungary, March 3, 2021. (Zsolt Szigetvary/MTI via AP)

Boxes of Sputnik V vaccines are ready to be unloaded from a truck at a warehouse of Hungaropharma, a Hungarian pharmaceutical wholesale company, in Budapest, Hungary, Thursday, March 4, 2021. (Zoltan Mathe/MTI via AP)

A pharmacist holds a packet of Sputnik V vaccines to be used for the first dose in the pharmacy of the Borsod-Abauj-Zemplen County Medical Center and University Teaching Hospital in Miskolc, Hungary, Tuesday, March 9, 2021. (Janos Vajda/MTI via AP)