Who is Oren Riff from By Way of Deception and what is their importance?

Oren Riff was a veteran Mossad operative and one of Ostrovsky's instructors at the academy. He tried to set up Carlos in Paris and is now targeted by Him. He was also responsible for the recruitment of Moukbarbel. Riff warned Victor several times not to question the tactics of the Mossad and to keep his mouth shut.