ne- is a prefix in Russian, though it is written separately from the verb, hence also written separately in Chinese Pidgin Russian.
netu is the negative form of the existential verb, meaning 'there is no'. In Pidgin, netu began to be used as a verbal negator, but it kept its lexical meaning:
dərugoj rabota netu 'there is no other work" (negative existential verb);
ponimaj netu 'I don't undestand' (verbal negator)
Source: Perekhvalskaya 2008: 221
Source: Jabłońska 1957: 168
Source: Arsen’ev 1949: 22
Source: Fadeev [1956] 1982: 11
Source: Perekhvalskaya 2008: 226