I'd avoid introducing Eucalypts to places they aren't already prevalent. Fires don't kill them, but do kill a lot of their competition, they drop very flammable leaf and branch litter, have oily explosive sap, so naturally they spread with fires. With more fires the more eucalypts spread, with more eucalypts there are more uncontrollable fires.

A country where Eucalypts are completely dominant is Australia. In the US California is full of them. Both Australia and California have uncontrollable fire problems.

There are plantations of eucalyptus trees in Brazil, either they don't know what introducing them will do to their country or they just don't care.

Before using eucalypts, consider what introducing a very invasive tree that transforms the countryside into something much more flammable than it originally was will do.