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Nobody quite knows with that means. one adviser to the ukrainian president said today, quote, it is impossible to say that the chernobyl power plants safe. nuclear weapons pose one kind of risk, especially in the hands of that kind of a leader. nuclear waste poses a different kind of risk. but now russia has direct control over both in and around ukraine. why does russia want to be at the chernobyl site in the first place? how dangerous is their presence there? and what do we make about russian president vladimir putin essentially threatening nuclear warfare? that nuclear weapons might be part...

Conflict, lawrence. >> and joining our coverage now, john will stall, who served as a special assistant to president obama as a senior director for arms control and nonproliferation at the national security council. also with us, david rothkopf, foreign affairs analyst and columnist for usa today and the daily beast. john, you have experience with these questions that the world is wondering about tonight, about a nuclear power plant on fire, or buildings close to it on fire inside ukraine. what do you make of the situation, as of this hour? >> i'm sorry that expertise has to come into play, an...