While reading Ancient Korea: Sea-ways of Cotton and Spice I came across an unexpected and intriguing passage from a Japanese record dated February of A.D. 642:(1)
The ambassador from Baekje threw the ambassador from Kunlun into the sea.
Baekje was one of the ancient kingdoms of Korea in the southwest of the Peninsula, while Kunlun ranged from South Vietnam to parts of Indonesia. This seemed so removed from diplomatic decorum I couldn't help but wonder what had happened.