Angelina Jolie poses for a picture with children in Lviv, Ukraine, on Saturday. Reuters

Jolie, 46, is a special envoy for the United Nations refugee agency, which says more than 12.7 million people have fled their homes in the past two months, which represents around 30% of Ukraine's pre-war population.

During the visit to the station, Jolie met volunteers working with the displaced, who told her that each of the psychiatrists on duty spoke to about 15 people a day. Many of those in the station are children aged from two to 10, according to volunteers.

Angelina Jolie poses for photo with her fans in Lviv. AP

"They must be in shock ... I know how trauma affects children, I know just having somebody show how much they matter, how much their voices matter, I know how healing that is for them," she said in reply.

At one point during her visit to the station, she tickled a small girl dressed in red, who laughed out in delight. She also posed for photos with the volunteers and some of the children.

Last month, in her role as special envoy, Jolie visited Yemen, where millions of people have been displaced by war.

Reuters