This is part of a disinformation campaign aiming to discredit Ukraine and Western vaccines against Covid-19. See our article on the topic of vaccines - It is all in the headline: the subtle art of information manipulation.
There is no reason to believe that the Pfizer vaccine is dangerous. Clinical trials of vaccines are subject to government inspections, in particular, by the Food and Drug Administration (FDA) in the US, which has access to patients participating in clinical trials, to documentation and other material evidence. The FDA did not accuse Pfizer of falsifying any clinical trials and successfully registered Pfizer's fluconazole after the said clinical trials.
On December 21, 2020, the European Medicines Agency granted a conditional marketing authorisation for the vaccine developed by BioNTech and Pfizer, following a rigorous evaluation. Conditional marketing authorisation means, that the available data indicates that the vaccine's benefits outweigh its risks and the applicant company should be in a position to provide the comprehensive clinical data in the future. The EMA concluded that there is sufficiently robust data on the quality, safety and efficacy of the vaccine.
It is also worth pointing out that the Minister of Health of Ukraine, Maksym Stepanov, did not say what kind of vaccine the residents of Donbas will be vaccinated with.
Read more cases that claim that Western vaccines are more dangerous than the Russian Sputnik V, or that Pfizer used to fake clinical trials, or that Pfizer might have delayed its vaccine announcement to get rid of Trump with EU encouragement, or even that criticism of "Sputnik V" is based on financial motives.