Europe is still struggling to avoid the threat of default as investors warned Greece will soon risk violating the terms of its second bailout in three years.

Seven months of negotiations ended in the pre-dawn hours in Brussels with Greece winning 130 billion euros ($172 billion) in aid it needs to avoid a March bankruptcy. Any respite may prove temporary after it signed up to a program of austerity and economic reform aimed at slashing debt to 120.5 percent of gross domestic product by 2020 from about 160 percent last year.

Even with investors and central bankers chipping in to relieve the debt burden, economists from Citigroup Inc. to Commerzbank AG concluded Greece may again fail to deliver amid a fifth year of recession, looming elections and social unrest. The upshot could be the removal of aid and renewed debate over the merits of fresh assistance before year-end as policy makers shift toward doing more to inoculate the rest of Europe from contagion.