The world's largest economies must do more to halt a global economic slide, and more government stimulus will be a top US priority at an international financial summit next month, dpa quoted President Barack Obama as saying today. Ahead of April's Group of 20 (G20) gathering of the world's leading economies, Obama warned against protectionist moves and acknowledged that developing countries were being "hard hit" by the fallout from an economic crisis that largely began in the United States. Obama cited the aggressive moves already taken by the United States - including an unprecedented 787-billion-dollar stimulus package - and suggested other countries must do more to halt the slide of their own economies. "As aggressive as the actions we are taking have been so far, it's very important to make sure that other countries are moving in the same direction, because the global economy is all tied together," Obama said in a meeting with Treasury Secretary Timothy Geithner.