By Asad Hashim ISLAMABAD (Reuters) - Pakistan was refusing to allow 30 migrants deported from Greece to disembark from a plane at Islamabad on Thursday, a week after talks with the European Union to settle a dispute over forced repatriations. A top EU official said last week Pakistan would stick to an agreement to take back citizens who are deported from mainland Europe, days after Pakistani Interior Minister Nisar Ali Khan said Islamabad was suspending a deal under which thousands per year are repatriated. Last year, about 21,000 living there without permission were ordered to return to Pakistan, according to EU statistics.