This is the 12343rd most frequent Russian word.
калининградские
"Kaliningradskie" means "related to Kaliningrad" (a region or city in Russia).
The word 'калининградские' is used as an adjective derived from Калининград, describing beaches in or associated with Kaliningrad.
Калининградские пляжи привлекают множество туристов летом.
The Kaliningrad beaches attract many tourists during the summer.
Here, 'калининградские' modifies 'законы', indicating laws that are specific to the Kaliningrad region.
Калининградские законы иногда отличаются от общероссийских.
Kaliningrad laws sometimes differ from those of all of Russia.
In this sentence, 'калининградские' refers to students who are from or studying in Kaliningrad.