This is the 11311th most frequent Russian word.
деоккупированных
"De-occupied" or "liberated from occupation."
Here, 'деоккупированных' serves as an adjective describing territories that have been freed from occupation.
Правительство представило программу восстановления деоккупированных территорий.
The government presented a reconstruction program for de-occupied territories.
In this sentence, 'деоккупированных' modifies 'регионов,' implying the regions have been liberated from occupation.
Жители недавно деоккупированных регионов начали возвращаться в свои дома.
Residents of recently de-occupied regions started returning to their homes.
'Деоккупированных' is used here to describe areas that have been claimed back and are now recovering after occupation.