US President Barack Obama will brief Prime Minister Dr. Manmohan Singh along with other world leaders by tomorrow on his new Af-Pak policy that is expected to cover sending thousands of more troops to fight Taliban and outline an exit strategy. Obama's call to Dr. Singh will take place close on the heels of the two leaders' meeting in Washington during which the Afghan issue was discussed prominently. Dr. Singh had said it is important for all major regional and international players to put their weight behind the Afghan government.<br/><br/>Obama had highlighted the importance of tackling violence and extremism emanating from the region in a serious way.<br/><br/>Meanwhile, the Afghan President Hamid Karzai and President Barack Obama discussed the new US policy for Afghanistan during an hour-long video conference call today morning.A spokesman for the Presidential palace said in Kabul that the video conference came ahead of Obama's planned speech today night at the US Military Academy where he will outline a new U S war plan and dispatch between 30,000 and 35,000 more American troops to Afghanistan. Karzai’s office says the two leaders discussed in detail the security, political, military and economic aspects of the strategy.<br/>