Europe's top court on Friday questioned the legitimacy of the "safe countries" list Italy uses to send migrants to Albania to await decisions on their asylum claims, in a fresh blow to a key aspect of the government's migration policy.

A ruling by the EU's top court has dealt a further blow to Italy's attempts to create a fast-track system in Albania for processing asylum applications offshore.

While ruling Italy's plan to fast-track migrant deportations is legal, the European Court of Justice set out some limits. Those include disclosing sources for their assessment of a country being considered "safe.