Ukraine has one of the lowest vaccination rates in Europe with only 35% of the population being double jabbed. Even that number could be an overestimation, however, as official data indicates that a large proportion of Ukrainian COVID certificates are forgeries. 

This situation worries German officials who are currently pushing for a mandatory vaccination law that would force the experimental mRNA products on the entire German population. 

https://www.lifesitenews.com/news/ukrainian-refugees-are-refusing-free-covid-jabs-from-german-govt/