Pakistan's Prime Minister Shehbaz Sharif has postponed a visit to Switzerland for a US-Iran ceremony because their agreement on ending the Middle East war had been signed remotely, his spokesman told AFP on Thursday."The proposed visit has been postponed as the Islamabad Memorandum of Understanding has already been electronically signed, has entered into force, and is now under implementation," spokesman Mosharraf Zaidi said, adding Pakistan would support the next phase of several "technical-level" tracks.