 But he believes they'll replace President Biden with Vice President Harris. Now, today, the president takes the world stage at the NATO summit that starts today in Washington. A big focus continuing to help Ukraine battle Russia after Monday's attacks that killed at least 38 Ukrainians. Yesterday, scenes drew international outcry. Ukraine's largest children's hospital was hit as a daytime Russian barrage struck five Ukrainian cities. Young cancer patients ran from the building, dragging their drips behind them.