Negotiation site that led to the 1994 Nobel Peace Prize (4)

I believe the answer is:

oslo

(Other definitions for oslo that I've seen before include "It's capital in Anglos London" , "Former Christiania" , "European capital, known until 1924 as Christiania" , "Solo in Norway?" , "Norway's capital city" .)

I've seen this clue in The New York Times.

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