Prior to 1975 , PRC - Thailand relations were one of mutual suspicion , as PRC supported left - leaning factions within the Thai political circle .
Thailand was wary of PRC involvement with Cambodia 's conflicts .
Prior to 1975 , PRC - Thailand relations were one of mutual suspicion , as PRC supported left - leaning factions within the Thai political circle and Thailand was wary of Chinese involvement with Cambodia 's conflicts .