Russian filtration camps for Ukrainians

Filtration camps, also referred to as concentration camps, are camps used by Russian forces during the Russian invasion of Ukraine to register, interrogate, and detain Ukrainian citizens in regions under Russian occupation before transferring them into Russia, sometimes as part of forced population transfers. Filtration camp detainees undergo a system of security checks and personal data collection.

Source: Wikipedia — Russian filtration camps for Ukrainians (CC BY-SA 4.0)