This is the 7705th most frequent French word.
russo
"Russo" is not a French word; it is Italian and means "Russian."
Here, 'russo' is used as a prefix in a compound adjective 'russo-américain,' describing the dual associated nationality of the diplomat's domain.
Le diplomate russo-américain a discuté des relations internationales.
The Russo-American diplomat discussed international relations.
In this sentence, 'russo' modifies 'orthodoxe,' forming a compound adjective meaning 'related to Russian Orthodoxy.'
Nous avons étudié la culture russo-orthodoxe au cours d'histoire.
We studied Russo-Orthodox culture in the history class.
'Russo' is used in a noun phrase 'guerre russo-japonaise,' identifying the war between Russia and Japan.