The Obama administration’s new proposal to Russia on Syria is more extensive than previously known. It would open the way for deep cooperation between U.S. and Russian military and intelligence agencies and coordinated air attacks by American and Russian planes on Syrian rebels deemed to be terrorists, according to the text of the proposal I obtained. Secretary of State John F. Kerry plans to discuss the plan with top Russian officials in a visit to Moscow on Thursday. As I first reported last month, the administration is proposing joining with Russia in a ramped-up bombing campaign against Jabhat al-Nusra, al-Qaeda’s Syria branch, which is also known as the Nusrah Front. What hasn’t been previously reported is that the United States is suggesting a new military command-and-control headquarters to coordinate the air campaign that would house U.S. and Russian military officers, intelligence officials and subject-matter experts.