New evidence of the real "big brother" watching the world? A trove of Pentagon documents that surfaced on social media since the beginning of March is believed to provide a rare window on the depth of U.S. surveillance worldwide. The Pentagon has not challenged the authenticity of the materials, but some countries affected have done so in apparent defense of their alliances with Washington. How credible are the materials? What does the leak tell us about the U.S.? What could be the potential consequences, especially regarding the war in Ukraine?