The White House says reports of an imminent attack by Iran on Israel is a real and viable threat. The U.S. and other countries warn their citizens against travel to the region. Families of hostages being held by Hamas in Gaza rallied outside the U.S. Embassy in Tel Aviv Friday, pleading for President Joe Biden to help secure the release of their loved ones. Russia’s war on Ukraine could also be reaching a dangerous turning point. A look at what it could mean for U.S. and European national security.