Vietnam eradicated Covid-19 by lots of testing, careful contact-tracing, and strict quaranteen.

As to the controversy about travel bans: if a country has few cases and is working hard to block transmission, a ban on entering the country makes sense because that pathway could bring in more casss than local transmission.

However, for a country in with many cases, and the majority come from local transmission, to ban on entering the country is gratuitous suffering.