The Mideast Quartet principals met in Munich for the first time in a year on Sunday and came out against unilateral Palestinian efforts to get the international community to impose a solution on Israel.Without mentioning the recent Palestinian efforts specifically, including the failed effort at the end of December to pass a UN Security Council resolution that would have called for a full Israeli withdrawal to the 1967 lines within three years, a statement issued at the end of the meeting said that sustainable peace requires negotiations.The meeting, which included US Secretary of State John Kerry, Russian Foreign Minister Sergey Lavrov, European Union foreign policy chief Federica Mogherini, and UN Deputy Secretary General Jan Eliasson, took place against the backdrop of sharp tensions between Prime Minister Benjamin Netanyahu and the White House over the premier’s scheduled speech to Congress on March 3.