Top Secret - Sensitive (VN war)
In Cambodia, it is conceivable that Hanoi may attempt to drive Sihanouk entirely over to the DRV side, and gain fuller access to Cambodian territory for sanctuary and for staging operations than is now the case.
https://static.blog4ever.com/2011/03/476705/artfichier_476705_244802_201106025242634.pdf