Leaders of Asian and Pacific nations have committed themselves to keeping stimulus measures in place to aid global economic recovery.The closing statement from their summit in Singapore also tried to bridge differences between the US and China on trade protectionism and currency exchange rates. Climate change and nuclear issues had also been high on the agenda of the Asia Pacific Economic Cooperation forum. President Barack Obama was there ahead of potentially difficult talks in China later in the week. The US recently imposed duties on Chinese-made tyres. APEC is the last major gathering of world leaders before the climate summit in Copenhagen in three weeks but little progress was made in Singapore on a new plan to combat global warming.