Leaders of the G20 nations risk missing the opportunity to strengthen the international financial system due to a desire not to forestall economic recovery, one leading analyst has claimed.Raghuran Rajan, a former chief economist at the International Monetary Fund who is now a professor at the University of Chicago, told Bloomberg that the desire to pull the global economy out of the downturn is taking precedence over efforts to prevent the next sharp contraction.He warned that unless stronger measures are taken to impose tougher regulations on financial services groups, the global economy will simply fall into another cycle of boom and bust."We're getting a recovery, so dealing with the true problems is going to be more difficult. The risk is that we're just going to tool around until the next crisis," he said.Gordon Brown has this week brought the populist notion of imposing a cap on executive bonuses to the fore once more in a bid to such calls for regulatory reform.In an interview with the Financial Times, the prime minister said that policymakers need to ascertain whether bonuses are set too high and whether they spur traders to favour short-term risks over long-term stability.