US President Barack Obama today spoke to Prime Minister Manmohan Singh and discussed with him the situation in Afghanistan and further steps required to bring peace and stability in the country. The Prime Minister's Office said, during the brief conversation, the two leaders also discussed the forthcoming summit on climate change in Copenhagen. Dr. Singh told Obama that India would play a constructive role in the negotiations and look forward to a successful outcome in Copenhagen. Obama's call to Singh takes place close on the heels of the two leaders' meeting in Washington during which the Afghan issue was discussed prominently.<br/><br/>Dr. Singh had said it was important for all major regional and international players to put their weight behind the Afghan government. Obama had highlighted the importance of tackling violence and extremism emanating from the region in a serious way.