Among the people caught in the chaos of Russia invading Ukraine are children. Children are among the unarmed civilians sheltering in subways and fleeing to neighboring countries in search of safety as Russia invades Ukraine. Many Ukrainians are heading to Poland, Hungary, Romania and Moldova, according to the UN. "The governments and people of those countries are welcoming refugees. It is now urgent to share this responsibility in concrete ways," Filippo Grandii, UN High Commissioner for Refugees, said on Sunday. Before Russia's invasion began, British, Ukrainian and U.S. officials warned the military assault would spark a monumental humanitarian disaster. Some estimates project that 3 million to 5 million Ukrainians could end up trying to flee their homes. 📸: @apnews and @gettyimages