It's the world's largest humanitarian crisis, yet aid groups say it has received far too little attention. As Sudan's civil war enters its fourth year, nearly two out of every five people face emergency-level hunger and humanitarian officials warn the crisis has been compounded by the closure of the Strait of Hormuz. Nick Schifrin reports. A warning, some images in this story are disturbing.

Ukrainian President Zelenskyy is accusing Russia of choosing war over peace, after Russian President Putin rejected his request for an in-person meeting. Putin spoke at an annual economic forum in St. Petersburg, a city on edge after several Ukrainian airstrikes earlier this week. Nick Schifrin reports.