I believe Kofi Annan became Sec. Gen. in Jan. 1997. Would have to check when Kojo Annan hooked up with Cotecna.
Cotecne sure has a Marc Rich sound to it but so far I have not made any connection. Another name I keep watching for in this OFF scandal is Michael Prest. He once worked for Rich but went out on his own as an oil trader in Nigeria, Lagos and Johannesburg.. His Company is Aurora based in Monaco.
Marc Rich is involved in the Oil for Food scandal via his company "Glencore" [sp]