* Obama sticks to position despite Russia, China objections
* Obama and Putin talk one-to-one, aide says no change
* Leaders say will work together to spur economic growth
ST. PETERSBURG, Russia, Sept 6 (Reuters) - U.S. President Barack Obama resisted pressure on Friday to abandon plans for air strikes against Syria and enlisted the support of 10 fellow leaders for a "strong" response to a chemical weapons attack.
