This is the 16633rd most frequent Russian word.
сербским
"Serbian" (related to Serbia or the Serbian language).
Here, the word 'сербским' is an adjective in instrumental case describing 'art' (искусство).
Я увлекся сербским искусством.
I became interested in Serbian art.
In this example, 'сербским' modifies 'colleagues' (коллегам), indicating the instrumental case usage for working collaboratively or assisting.
Мы обещали помочь сербским коллегам.
We promised to help Serbian colleagues.
Here, 'сербским' describes 'language' (языке) in instrumental case, showing usage in communication context.