 The NATO summit opening in Washington, D.C. today in the wake of a Russian missile bombardment on Ukraine that included hitting the country's biggest children's hospital. Heartbreaking scenes as the sick youngsters, some with wounds from the blast, were led to safety. Rescuers and dozens of volunteers, including medics, wearing scrubs and lab coats, forming a human chain, combing frantically through the rubble for survivors. As children undergoing life-saving treatments were forced to sit on the sidewalk. ABC's Ian Pannell.