European leaders agreed on a permanent rescue fund for the euro zone Monday as they met in Brussels to finalize a comprehensive compact to deal with the continent’s sovereign-debt crisis. Leaders of 25 nations agreed to the deal, but the U.K. abstained once again. But some differences still need to be worked out. The summit declaration is also expected to be overshadowed by the negotiations in Greece, where a deal between the government and the private sector to write off half the debt still needs to be reached in order for the country to avoid default. Europe's stocks fell on the news.