Experts and officials document huge scale of destruction wreaked by Russian forces.
Legal changes called for to help meet the challenge of a flood of new incidents.
Kyiv is facing a challenge to fulfil its legal and social obligations to those living in areas controlled by Russia.
Processes will effectively legitimise the de facto occupation authorities while discrediting genuine efforts to see justice.
Tens of thousands in Crimea and eastern Ukraine have been recruited to fight on behalf of the occupying forces.