CLEAN : Four of Greeces five hotspot migrant centres ready

The transcript discusses various topics, starting with an introduction and context setting. It then moves on to the support for Greek authorities, focusing on tax guest officers. The video also covers screening purposes to establish the nationality of immigrants. Agreements with Germany, Turkey, and NATO are highlighted to manage the flow of immigrants. Finally, the transcript assures continued assistance for refugees.

What role do Greek authorities play in the context of the text?

What is meant by establishing the nationality of people?