This is the 14500th most frequent Russian word.
палестинских
"Palestinian" (adjective, relating to Palestine).
In this sentence, 'палестинских' is used as an adjective qualifying the noun 'территорий', indicating possession or association with Palestine.
Мирные переговоры включали представителей палестинских территорий.
The peace talks included representatives from Palestinian territories.
Here, 'палестинских' modifies 'художников', describing that the artists are of Palestinian origin.
На выставке были представлены фотографии палестинских художников.
The exhibition featured photographs by Palestinian artists.
'Палестинских' acts as an adjective for 'жителей', emphasizing that the residents are from Palestine.