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>> hannah hopko, thank you so much. coming up next, nato has activated its response force for the first time ever. what does that mean exactly? and what more can nato do? talking about this with hannah, what more can nato do? and the u.s. do to slow russias aggression? and one thing the u.s. has already done is sanctions, but what impact will these financial punishments really have? later, a warning from ukraines nuclear regulators who say the russian activity around chernobyl is kicking u...