This is the 871st most frequent Bulgarian word.
руското
The Bulgarian word "руското" translates to "the Russian" in English.
Here, 'руското' is used as a possessive adjective referring to something that belongs to Russia (the country).
Руското знаме е трицветно.
The Russian flag is tricolor.
Here, 'руското' describes 'изкуство' (art), indicating that it is related to Russia or has Russian origins.
Четох книга за руското изкуство.
I read a book about Russian art.
Here, 'руското' specifies 'кулинарно наследство' (culinary heritage), attributing it to Russia.