Preparing for Russian aggression in Estonia
Because they were a part of the old Soviet Union, the Estonians are familiar with Russian weapons and tactics. I think that makes them a valuable ally for NATO and it is a resource the US should take advantage of. The Estonians have also been something of a success story in Eastern Europe where they have grown their own high-tech industry. They have no desire to be a part of a new Russian empire.
A NATO member, Estonia is using an improbably popular form of “military sport” to help put together a guerrilla resistance army — just in case.