US Secretary of State John Kerry threatened to impose sanctions on the Palestinian Authority if its president Mahmoud Abbas continues appealing to the United Nations for an independent state, according to a report by Ma'ariv.The threat, originally reported in London paper Al-Ahbariya, came about during a telephone conversation between Kerry and Abbas, where Kerry reportedly said "There are outcomes to one-sided Palestinian moves." According to the source, Kerry threatened to impose financial and political sanctions.Another unnamed source reportedly said on Arab television that Kerry ordered Abbas "to return to the negotiation table with Israel."