Solidarity is one of the oldest but still ambiguous principles of the European Union (EU). In the year 2020, COVID-19 took its place among many other previous litmus tests over solidarity. Initial reluctance of European instutions and lack of effective joint counter-disaster mechanisms, to cope with the unprecedented social and economic devastation caused by the pandemic, triggered once more a wave of harsh criticism of solidarity principle. Although the pandemic did not reach to its end, and it is still too early to measure its overall results in the EU, the article asserts that, a positive tendency for European members' adherence to solidarity principle is on rise.