Over 39,000 human trafficking cases reported in Europe over two decades.
Conflict and displacement, particularly from Ukraine, are increasing risks.
Victims are subjected to forced labour and sexual exploitation.
Briefing: Trafficking victims: Number in Europe might be 'much higher' than previously thought
Strategic angle: More than 39,000 human trafficking cases were recorded in Europe in 20 years, with war and displacement exacerbating the crisis.