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That are in western europe could be pushed east towards europe's eastern flank and nato's eastern flank to be ready for whatever russia decides to do. oren lieberman, cnn, the pentagon. >> thanks, oren. let's get more on this story. cnn's nic robertson joins us from moscow. give us a sense of what the kremlin is saying, especially that the u.s. is ready to deploy 8,500 troops. is it rattling putin a bit? >> it doesn't appear to be. it can potentially play into his hands in a way. the current sort of escalation tensions and the draw down of diplomats by the british, the united states and the ...

Ukranian fighters are forced to retreat to positions and were to take up positions in countries bike like poland or romania, that has implications for nato. if there is errant shelling that hits. so you could think of numerous ways i think that fighting in ukraine could potentially spill over. and so it really is important i would say that the united states should lean in now to pre-position those forces so that we are prepared for those types of outcomes. and i would say also very importantly to show alliance resolve so that putin doesn't have any questions about testing any nato member state...

Discuss that nbc news reports that jamie harrison considered early exit amid white house tensions go on to say that he is frustrated, isolated trapped in a job he long thought he wanted. a dynamic driven by escalation tensions with the white house over his role. harrison frustrated enough to consider an escape route key part before the midterms. what do you think is going on at the dnc. >> lots of people want to escape from the dnc and from the white house and from especially congress, some retirements. shannon in a nutshell, it's desperate on the democratic side that does not upset me at all....