Thank you for the Wiki-Link, ListmyCDs.com!
I'm sure you already know that "in 1942, Rachmaninoff moved to Beverly Hills, California. He acquired U.S. citizenship a month before his death from advanced melanoma."
"In August 2015, Russia announced its intentions to seek reburial of
Rachmaninoff's remains in Russia, claiming that Americans have neglected
the composer's grave while attempting to "shamelessly privatize" his
name. The composer's descendants have resisted this idea, pointing out
that he died in the U.S. after spending decades outside of Russia in
self-imposed political exile."
Would you still list him as a Soviet composer? As a Russian Composer? As a US composer?
What I want to say: "primarily identified with" is pretty vague and obviously not unique/distinct/unambiguous.
Should an encyclopedia not be exactly the opposite and offer clear and correct informations?