By Nandita Bose, Yomna Ehab and Humeyra Pamuk
WASHINGTON/DUBAI/ZURICH, June 19 (Reuters) - Switzerland said U.S. talks with Iranian negotiators on a pact to end the Middle East conflict would not take place on Friday, while Vice President JD Vance dropped plans to travel there, fuelling uncertainty whether a lasting truce can be found.
"The logistics of these negotiations have never been simple or predictable," a White House spokesperson said in a statement on Thursday.
