A child says goodbye to a relative through the window of a train car Sunday at a railway station in Kramatorsk, eastern Ukraine. Photo: VCG

A man waits with his child at a train station in Kyiv, Ukraine, on Wednesday. The escalating war between Russia and Ukraine has threatened the lives and well-being of children in Ukraine. Photo: VCG

A girl arrives at a border crossing with her parents on Tuesday in Záhony, Hungary. Photo: VCG

A child rests on a suitcase after crossing the Moldova-Ukraine border checkpoint near Palanca, Moldova, on Wednesday. Photo: VCG

A girl stands outside a tent at a temporary camp in Przemyśl, Poland, on Tuesday. Photo: IC Photo

Refugee children sleep on the floor Sunday at a train station in Przemyśl. Photo: VCG

A girl plays with her toys inside a vehicle at a temporary camp in Przemyśl on Monday. Photo: IC Photo

A girl sitting on luggage eats food Monday at a temporary camp in Przemyśl. Photo: IC Photo

Children play at a refugee camp in Chișinău, the capital of Moldova, on Tuesday. Over 1 million people have fled Ukraine, the United Nations said Thursday. Photo: IC Photo

Children take shelter with their pets at the Kyiv Metro Station in Kyiv, Ukraine, on Wednesday. Photo: VCG

Children look out from a tent Wednesday at the Dorohozhychi Metro Station, which is being used as a bomb shelter in Kyiv. Russia has intensified attacks on the capital city, destroying infrastructure such as rail lines. Photo: VCG

A refugee child fleeing Ukraine makes a heart-shaped gesture in front of the camera while waiting at Budapest’s Nyugati Railway Station in Hungary on Monday. Photo: IC Photo

A child with cancer holds a sign saying “Stop War” Monday at a bomb shelter in Kyiv. Photo: VCG