What does "The" emphasize in the phrase "The UK has approved a COVID vaccine"? It seems to mean that "UK has approved a COVID vaccine" is itself OK. I am not very sure.
The UK has approved a COVID vaccine — here’s what scientists now want to know The Pfizer–BioNTech vaccine has passed safety and efficacy tests — but scientists still have many questions about how this and other vaccines will perform as they’re rolled out to millions of people.
Source: Nature Dec.3, 2020