Guess EU will publish a list soon if they can agree. My guess is that US will be on the list. The rest will be similar to the latest Latvian entry restriction. This is only my guess!
In Netherland travel for non-essential purposes has been permitted for arrivals from the following seven third countries:
Australia
Israel
New Zealand
Rwanda
Singapore
South Korea
Thailand
"The authorities of Latvia will now allow persons who have completed the vaccination against the COVID-19 to skip self-isolation when they enter the country.
In a press release issued by the Latvian Ministry of Transport, it was pointed out that all persons returning from a European Union or European Economic Area country, Switzerland, or the United Kingdom will be exempt from the self-isolation requirement.
However, the testing requirements for all those vaccinated still remain in place. Everyone is required to present a negative COVID-19 test result not older than 72 hours."