Islands don't really matter, but closed borders do. Europe has very different policies and rates of spread, but open borders mean that no country in the EU can eradicate Corona if the rest doesn't eradicate it at the same time. Case in point, Germany was at practically zero (around 1% positive tests with a 1% false positive rate) 6 weeks ago, currently it is lagging 3 weeks behind all its neighbors in the number of cases, rising exponentially.