The Soga clan had a sense of danger that Japan was also exposed to the menace of Tang Dynasty which was founded in 618 as it was growing its clout in the Korean peninsula.
当時618年に成立した唐が朝鮮半島に影響力を及ぼし、倭国も唐の脅威にさらされているという危機感を蘇我氏は持っていた。