Croatia has not had a single case of COVID-19 for 3 days in a row [1], and has been allowing citizens of several European countries, including ones like Germany, come there [2], since mid-May.
This stuff is not rocket science, and while Croatia will not completely eradicate COVID-19, which is unfortunate, it still is impressive.
[1] https://koronavirus.hr/en [2] https://koronavirus.hr/frequently-asked-questions-and-answer...