The distinction really only matters to orthodox christians and not even them most of the time. There are a lot of churches that are in the russian tradition while not actually being part of ROCOR, which is indeed tiny though I don't believe its numbers were hurt by the ukraine war.

OCA is the second-largest jurisdiction (distantly, behind the greeks) in the US and most of its parishes could be described as "english language russian orthodox" though they are not ultimately under the patriarch of moscow. Which is close enough to what most nonorthodox mean when they say russian orthodox. The jurisdictional situation is a mess but since the churches are all in communion with each other individuals are free to not care about it and most exercise that freedom.