China's People's Liberation Army (PLA) has "incrementally" occupied nearly 640 square km of area on the Line of Actual Control (LoAC) in Ladakh in the past few months.The shocking revelation came in a report submitted by the National Security Advisory Board (NSAB) to the Prime Minister's Office.Headlines Today has accessed the details of the damning report, submitted by former foreign secretary and NSAB chairman Shyam Saran to the PMO on August 12.According to the report, patrolling limits set by incremental PLA area denial in eastern Ladakh region of Jammu and Kashmir have now become the de facto LoAC.The resulting area denial is effectively a loss of 640 sq km across three sectors in Depsang, Chumar and Pangong Tso, the report said.It said Indian troops are no longer able to access at least four points on the patrol line, thereby denying an area earlier accessible to them.Moreover, after PLA incursions in April and May, Depsang Bulge is no longer accessible to Indian forces.The report also highlights that the PLA's un-metalled road across the LoAC in Raki Nallah area of Daulet Beg Oldi (DBO) sector is still motorable.Approximately 70 sq km of Indian territory is now effectively under the PLA's control at Pangong Tso, the NSAB has assessed.The PLA has repeatedly intruded into Jammu and Kashmir and Arunachal Pradesh over the last few months. But India has failed to register a strong protest to the aggression.