ISLAMABAD, April 11 (Xinhua) -- The United States, Pakistan, and Iran on Saturday held a face-to-face trilateral meeting in Islamabad, according to Pakistani sources. Meanwhile, media reports citing the White House said that U.S. Vice President JD Vance, U.S. special envoy Steve Witkoff and Jared Kushner were in the meeting. Some reports said that the meeting was also attended by Pakistani Chief of Army Sta