Fiona Hill is a former White House official who advised presidents Bush, Obama and Trump on European and Russian affairs, and who is perhaps best known for her testimony in President Trump's impeachment hearings.
Now she has written a book, There Is Nothing For You Here, about her life, her path to the White House and the declining politics of the US, Britain and Russia.
She talks to Hugh Linehan about the book and the current tensions in Eastern Europe.
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