In order to counteract one of Europe’s lowest birth rates, the government of Poland put out a pair of videos urging citizens to breed like rabbits.
https://youtu.be/gnQpfXtdPuA
Population estimates are 2017 Eurostat projections, in thousands.
Eurostat expects 10 countries will lose population by 2040. Poland is in 7th place.
In general, the demographic trends in Eastern Europe are very poor.