WASHINGTON/DUBAI, June 19 -- US Vice President JD Vance has cancelled a planned trip to Switzerland for talks with Iranian negotiators, highlighting ongoing uncertainty surrounding the implementation of the recently signed US-Iran peace agreement.

According to a White House spokesperson, Vance and a US delegation were prepared to travel to Geneva to begin discussions on carrying out the 14-point accord reached between Washington and Tehran to end months of conflict. However, the visit was called off after difficulties emerged over the logistics and timing of the negotiations.

The United States had initially indicated that a formal signing ceremony would be held in Geneva. Iran's foreign ministry, however, questioned the need for such an...