Washington/Bern, June 20 -- US Vice President JD Vance said on Saturday he expects to travel to Switzerland within days for talks with Iran, adding that negotiations could take place as soon as Sunday as diplomatic efforts continue over regional security tensions and a fragile ceasefire environment.

Speaking to Fox News, Vance said senior U.S. officials were already on the ground and that discussions with Tehran were progressing.

Vance said U.S. special envoy Steve Witkoff and presidential adviser Jared Kushner were already in Switzerland ahead of the talks, and expressed cautious optimism about the trajectory of negotiations.

"US special envoy Steve Witkoff and Jared Kushner were already on the ground for the talks," he said, adding tha...