Most Estonians don’t think much of Narva. It’s a slum with lots of drunks, HIV infections, etc. Nevertheless, the Estonias would fight for it. Or try to. But without NATO help, they obviously couldn’t stop Russia. For starters, they don’t have their own air force. (NATO fighter jet units take turns providing patrols for all three Baltics).
Actually maybe a little bit of ethnic cleansing would make sense? Pay them to return to Russia and continue to enhance the miserable conditions in Russian ethnic areas. This really points to the absurdity of the “Diversity is our Strength” mantra.