Hacking Ukraine and beyond, Hong Kong pop with a purpose, and will the Navajo Nation leave coal behind?

Another cyberattack is wreaking havoc across Europe. And, Western tech companies in Russia have been complying with demands to hand over the source code of their products for government officials to review. Plus, the time when North and South Korea teamed up to win a world championship in table tennis. Also, the Navajo Nation says it might be time to leave coal behind.