https://reisitargalt.vm.ee/
Also, due to Russia’s military action, we advise against non-urgent travel to Belarus. We recommend Estonian nationals currently in Belarus reconsider their need to remain in Belarus and return to Estonia if possible. We urge you to completely avoid regions bordering Ukraine.
Estonian nationals in Belarus are urgently advised to register their stay on the Reisi Targalt site of the Ministry of Foreign Affairs: https://reisitargalt.vm.ee/