our planet offers countless sources of energy. but it's only human to find the ones that could power a better future. more now on our breaking news. president biden promising more harsher sanctions after the ones he announced today if russian troops encroach further into ukraine. our frederik pleitgen is in russia near those regions of ukraine controlled by the russian-backed separatists. fred, you've been there for a long time now talking to a lot of people, doing some phenomenal reporting. what's the latest you've seen in recent hours? >> reporter: hi, john. it certainly was extremely interesting and insightful to be able to go into that area, which is right near the border with ukraine and right at the border with the donbas region, which is of course those separatist