The Baltic countries of Estonia, Latvia, and Lithuania formed their travel bubble earlier this month that is opened for nationals/residents of 14 Schengen countries as of June 1, 2020.
Here are the countries from where passengers can enter without checks:
- Czech Republic
The following require 14-day mandatory quarantine:
- United Kingdom
The European plan appears to be to get the intra-Schengen travel going on June 15, 2020. Spain, Italy, and Greece have all indicated that they would relax the requirements by July.
It is still unclear, however, when and what requirements there might be for those wishing to enter the Schengen area this summer if a non-EU citizen or resident.
I tend to visit Estonia two or three times a year to see friends when in the area, and I have been tp Latvia only twice and Lithuania once.