This is the 3538th most frequent Russian word.
российское
"Российское" means "Russian" (related to Russia as a country or state).
In this sentence, "российское" acts as an adjective describing "кино" (cinema), indicating that the cinema is associated with Russia.
Я люблю российское кино.
I love Russian cinema.
Here, "российское" modifies "правительство" (government), denoting that the government is from or related to Russia as a state or country.
Мы обсуждали российское правительство.
We were discussing the Russian government.
In this instance, "российское" modifies "литературы" (literature), specifying that the literature originated in or is culturally connected to Russia.