The situation in Ukraine is creating a child protection crisis of extraordinary proportions, according to UNICEF's Regional Advisor - Child Protection for Europe and Central Asia, Aaron Greenberg.

Greenberg made the remarks at a press briefing on Friday at the Palais des Nations in Geneva.

"Two months of war in Ukraine have left 7.7 million people internally displaced and driven over 5.5 million people across international borders, including nearly two-thirds of all children in Ukraine. Hundreds of children have been killed and many more have been injured," he pointed out.

"Nearly 200 attacks have been reported against health care facilities, and schools continue to be impacted by strikes."

The UNICEF official noted that the conflict has also impacted children's psychological wellbeing, amid constant explosions and sirens of missile alert systems, missing caregivers and siblings, and displays of physical and sexual violence.

Greenberg said the experience the children are going through now may leave them with post-traumatic stress disorder.

He called for concerted efforts to retain and avail social workers, child psychologists, and other professionals to help those affected.