What key details about ri yong-mu  can be extracted from the following bio?  Bio: ri yong-mu -lrb- born january 25 , 1925 -rrb- is a senior north korean official . he is a member of the politburo of the workers ' party of korea , vice-chairman of the national defence commission of north korea and vice-marshal of the korean people 's army . he is the oldest member of the central leadership of north korea .
A:
- context is north- hangul is 리용무- mr is ri yong-mu- rr is ri yong-mu- hanja is 李 勇 武