BRUSSELS - Europe has persevered through a year of challenges in 2021, in the wake of Brexit and amid painstaking efforts towards economic recovery from the COVID-19 pandemic. As the year draws to a close, the unfolding consequences of Brexit, speculations over a Polish exit from the European Union (EU), and the lingering migrant crisis have continued to weigh heavily on EU member states' sense of cohesion and solidarity. Thorny post-Brexit issues In one of the most heart-breaking headli...