I doubt it's mandatory and every year in all of Europe, although that would fit my expectations of ex-Soviet and former-Eastern-Bloc countries.

In England it is free, but at best it's automatic once. Otherwise it's up to the parent to arrange.

In Denmark it's done at age 2, 3, 4, 5, 6 and 7.

Statistics for 30 countries: https://ec.europa.eu/research/participants/documents/downloa...