Defense Secretary Hagel tells CNN 's Jim Sciutto that ISIS must be stopped . ' The U.S. military is working with the Iraqi government and Kurdish forces in an effort to retake Mosul, Iraq's second-largest city, from ISIS. No ground invasion of Iraq or war with Russia over Ukraine , he insists . President Obama has been criticized for not attacking ISIS in Syria .
Defense Secretary Hagel tells CNN 's Jim Sciutto that ISIS must be stopped . The U.S. military is working with the Iraqi government and Kurdish forces in an effort to retake Mosul, Iraq's second-largest city, from ISIS. No ground invasion of Iraq or war with Russia over Ukraine , he insists . President Obama has been criticized for not attacking ISIS in Syria .