Ang Chan acknowledged both Siamese and Vietnamese suzerainty over his country, Cambodia, hoping to keep the peace by paying tribute to Siam and Vietnam.
Seemingly perturbed, and with growing apprehension of Chan's most friendly entente cordiale with Viet Nam and to his Emperor Gia Long,[REF] the Siamese King Rama II had decided to have a more acquiescent ruler to his imposing geo-political asset; therefore, he resolved to oust Ang Chan by military pressure.