The International Monetary Fund (IMF) has cautioned that fiscal sustainability is going to be a big problem for the coming several years.The warning comes in the backdrop of many countries piling up massive debts in the wake of the global crisis.<br/><br/>To tackle the raging financial turmoil, many developed and developing nations came up with huge stimulus measures to bolster their respective economies.<br/><br/>IMF Managing Director Dominique Strauss-Kahn has said the crisis had created a problem of fiscal sustainability in many countries, that could take decades to fix. Strauss-Kahn was addressing a conference in Tel Aviv. He said, it is important at this stage for countries to announce a credible strategy to bring their debt back to more sustainable levels.<br/><br/>Even though the world economy is recovering faster than expected, the IMF chief pointed out that withdrawing stimulus measures early, then the risks for the economy would be much bigger.