Vaccines should be distributed in the European Union strictly according to the population of its member states until 70 percent of the adult population is vaccinated against COVID-19, Czech Prime Minister Andrej Babiš has told CTK. Babiš said it in connection with a letter signed by the Austrian PM Sebastian Kurz, Bulgarian PM Bojko Borisov, Croat PM Andrej Plenković, Latvian PM Krisjanis Karins, Slovenian PM Janez Jansa and himself, addressed to European Commission President Ursula von der Leyen and European Council President Charles Michel and released on Saturday.