This is the 1094th most frequent Russian word.
российскую
"Российскую" means "Russian" (related to Russia as a country).
In this sentence, "российскую" is used as an adjective modifying a feminine singular noun "культуру", which means "culture".
Я люблю российскую культуру.
I love Russian culture.
Here, "российскую" describes the feminine singular noun "команду", meaning "team", indicating its association with Russia.
Эта российскую команду знает весь мир.
This Russian team is known all over the world.
"Российскую" functions as an adjective qualifying the noun "выставку" (exhibition), which identifies the origin or association of the exhibition with Russia.