More than 500,000 refugees have fled Ukraine amid Russia's ongoing invasion, the United Nations Refugee Agency says. CNN's Erin Burnett and her team capture how difficult the journey is out of the country. | CNN

Social media footage has played a key role in news coverage of the Russian invasion of Ukraine, revealing new attacks and military movements. But making sure the videos and images are real and accurate is important. Here's how our investigative team does it. | CNN